Is Belief in God Properly Basic? Reformed Epistemology and Rational Faith Without an Argument

In 1876 the English mathematician William Kingdon Clifford read a paper to London's Metaphysical Society that opened with a story about a ship. A shipowner is about to send an emigrant vessel to sea. He knows she is old and was not well built in the first place, and he has been warned she may not be seaworthy. The doubts trouble him, so he talks himself out of them: she has come safely through many voyages, and Providence will surely protect the families aboard. He watches her sail with a light heart. She goes down in mid-ocean, and Clifford's verdict is that the owner is guilty of those deaths. His belief was sincere, but he had acquired it by stifling his doubts rather than by investigating them. Clifford then adds the twist that made the story famous: even if the ship had come home safely, the owner would have been no less guilty, because the wrong lay in how he came to believe, not in how things turned out. From the story Clifford drew a principle that still sets the terms of the debate: "It is wrong always, everywhere, and for anyone, to believe anything upon insufficient evidence."¹

Now consider a different scene. A woman who has never read a word of philosophy kneels by her bed at night and thanks God for the day. She has not worked through the kalam argument or weighed the fine-tuning data. Asked why she believes, she might say she simply knows God is there: she senses his presence when she prays, feels his displeasure when she has done wrong, and cannot look at the night sky without thinking that Someone made it. Is she Clifford's shipowner? Is her sincere belief a kind of intellectual negligence?

The answer developed over the last half-century by the philosopher Alvin Plantinga and his allies, usually called Reformed epistemology, is that she need not be negligent at all. Belief in God, they argue, can be properly basic: rationally held, and possibly even knowledge, without being inferred from any argument. One thing should be said at the outset. Reformed epistemology is not an argument that God exists. It is a reply to one particular charge, namely that belief in God is irrational unless it rests on argument. As a reply to that charge it is, in our judgment, strong. As a proof of God it was never intended, and should never be presented as one.

The evidentialist challenge

Clifford's principle was resisted from the start. William James's "The Will to Believe" (1896) was written largely as a reply to it, arguing that in certain live, forced, and momentous choices we may legitimately believe ahead of conclusive evidence.² But James's reply conceded a good deal to Clifford's picture: it treated religious belief as a venture beyond the evidence. The more influential modern heir of Clifford was the British philosopher Antony Flew. In "The Presumption of Atheism" (1972), Flew proposed that debates about God should begin from a default of what he called "negative atheism," simply not being a theist, and that the burden of proof lies entirely on the believer. The theist must first give a coherent concept of God and then supply sufficient reason to think the concept applies; until he does, the rational position is unbelief, much as a defendant is presumed innocent until proven guilty.³

Plantinga gave this family of views a name: the evidentialist objection to belief in God. Its core claim is that belief in God is rationally acceptable only if there is sufficient evidence or argument for it. Some believers share it, holding that faith is rational only because natural theology supplies the needed proofs. Plantinga's opening move was to observe that skeptic and believer alike, in this camp, rely on a particular theory of rational belief, and that the theory deserves inspection.⁴

The theory is foundationalism, in its classical form. Foundationalism itself is a modest idea about the structure of knowledge. Some of our beliefs are held on the basis of other beliefs: I believe it rained last night because the street is wet. But this chain of support cannot go back forever. Somewhere there must be beliefs that are not held on the basis of any others; philosophers call these basic beliefs, and they form the foundation on which the rest is built. The real question is which beliefs may properly sit in the foundation. Classical foundationalism answers strictly: a belief is properly basic only if it is self-evident (like "2 + 1 = 3"), incorrigible, meaning I cannot be mistaken about it (like "I seem to see something red" or "I am in pain"), or, in the older ancient and medieval version, evident to the senses. Everything else must be supported, ultimately, by beliefs of those kinds. Belief in God is not self-evident, not incorrigible, and not evident to the senses. So, on this view, it must be argued for, or else it is irrational.

Plantinga's critique of classical foundationalism

Plantinga's response, set out most compactly in his 1981 paper "Is Belief in God Properly Basic?", has two prongs.⁴

The first is that classical foundationalism condemns far too much. Consider the beliefs that there are other people with minds like yours, that the world existed five minutes ago, that your chair still exists when you leave the room. None of these is self-evident or incorrigible, and none has been successfully derived from beliefs that are; the early modern attempts to build them up from the bare foundations are widely judged to have failed. If classical foundationalism were true, nearly everything you believe about the past, the physical world, and other people would be irrational. That is not a discovery about your beliefs; it is a reason to doubt the theory.

The second prong is sharper. Classical foundationalism is itself a belief: the belief that a proposition is properly basic only if it is self-evident, incorrigible, or evident to the senses. Is that belief self-evident? Plainly not, since a great many thoughtful philosophers reject it. Is it incorrigible, or evident to the senses? No. Has anyone shown that it follows from beliefs that are? Plantinga argued that no one has, and that it is hard to see how anyone could. So by its own standard, the classical foundationalist ought not to accept classical foundationalism. Plantinga's term for this was self-referential incoherence: the criterion fails the test it sets for everyone else.⁴

Honesty requires a qualification here. Refuting classical foundationalism does not refute every form of evidentialism. Contemporary evidentialists such as Earl Conee and Richard Feldman defend a broader view on which a person's evidence includes her experiences, not just other beliefs, so that a belief can be supported by how things seem to her without being inferred from a premise.⁵ On a view like that, the gap between the evidentialist and the Reformed epistemologist narrows considerably, and much of the dispute turns into a quarrel about what counts as evidence. That is an important point. But it is worth noticing what has happened. The original challenge said that belief in God needs an argument. Once evidence is widened to include experience, that demand has, in effect, been withdrawn.

What "properly basic" means

The phrase has two parts, and both matter.

A belief is basic for a person when she does not hold it on the basis of other beliefs. My belief that I had coffee this morning is basic: I do not infer it from evidence, I simply remember it. My belief that there is a tree outside the window is basic: I do not reason my way to it from my visual sensations, I just see the tree. A belief is properly basic when it is rightly held in that way: when holding it without an argument involves no intellectual fault, and (in Plantinga's later work) when it can amount to knowledge.

Plantinga had been circling this idea since his first book, God and Other Minds (1967). There he found each of the classic arguments for God, taken alone, less than conclusive, and found that the classic argument for other minds (the argument from analogy, by which I infer from your behavior that you have thoughts like mine) fared no better. Yet no one thinks belief in other minds is irrational. Plantinga's conclusion was that if belief in other minds is rational despite the weakness of the arguments for it, then the weakness of the theistic arguments does not, by itself, make belief in God irrational.⁶ Behind this lies an older voice: the eighteenth-century Scottish philosopher Thomas Reid, who argued that perception, memory, and testimony are trustworthy sources of belief in their own right, needing no certificate from reasoning. Nicholas Wolterstorff, Plantinga's closest collaborator, later wrote a book-length study of Reid's epistemology.⁷ He pressed the point in terms of entitlement (in his essay in Faith and Rationality): a belief is innocent until shown guilty, not guilty until proven innocent.

Basic, but not groundless

The most common misunderstanding of Reformed epistemology is that "properly basic" means "groundless": believed for no reason at all, by sheer will. Plantinga insisted on the opposite. A perceptual belief is basic, but it is not groundless; it is formed in a characteristic experience. I believe there is a tree because I am, as philosophers sometimes put it, appeared to in a tree-like way. The experience is not a premise in an argument. It is the circumstance in which the belief arises, and it is what makes the belief appropriate.

Plantinga proposed that belief in God works the same way. Strictly speaking, the beliefs that are properly basic are not the bare proposition "God exists" but more particular beliefs formed in particular circumstances: God made all this, formed while looking at the starry heavens or a flower; God disapproves of what I have done, formed in the experience of guilt; God forgives me, formed in the experience of confession; God is speaking to me, formed while reading Scripture. Each of these entails that God exists, so belief that God exists comes with them, with no theistic argument needed.⁸ The pattern will sound familiar to readers of Scripture: "The heavens declare the glory of God" (Psalm 19:1); "the invisible things of him from the creation of the world are clearly seen, being understood by the things that are made" (Romans 1:20).

This is where Reformed epistemology meets the argument from religious experience, and it is worth being precise about how they differ. Our essay on religious experience examines Richard Swinburne's Principle of Credulity, which treats an apparent experience of God as evidence that raises the probability that God exists, and William Alston's account of Christian practice as a socially established way of forming beliefs about God.⁹ Alston was Plantinga's close ally, and the projects overlap heavily. The distinctive emphasis of Reformed epistemology is that the experience need not function as a premise at all. The believer in the starlight is not reasoning "I have this experience, experiences are probably reliable, therefore God exists"; the belief arises directly, as perceptual beliefs do.

Defeaters and defeater-defeaters

A properly basic belief is not an unrevisable one. Basic beliefs can be defeated. Suppose you look across a field and see what appears to be a sheep, and you form the basic belief that there is a sheep in the field. Then the farmer tells you that he owns a dog that is often mistaken for a sheep. You now have a defeater: not a proof that there is no sheep, but a reason that undercuts your grounds for thinking there is. If the farmer then adds that the dog is away at the vet this week, you have a defeater for your defeater, and your original belief can stand again.

So Reformed epistemology does not say that believers may ignore objections. It says that belief in God can be rational before any argument is supplied, but that a believer who meets a serious objection (the problem of evil, say) may need a defeater-defeater to go on believing rationally. That defeater-defeater may be an argument: Plantinga's own free-will defense, for example, which aims to show that God and evil are logically consistent (a defense, not a proof, and Plantinga presented it that way).¹⁰ Or it may be that the believer's grounds are simply stronger than the objection. Either way, the order of operations has changed: the believer is not required to prove God before being entitled to believe, but she is required to take real objections seriously when they come.

From rationality to warrant: how the view developed

Plantinga's own story fits his philosophy. In a 2017 interview he recalled that during his first year at Harvard, where he met for the first time brilliant people who rejected Christianity, he was walking back from dinner one dark and rainy evening when it suddenly seemed as though the whole sky lit up, and it seemed simply obvious to him that the Christian story was true.¹¹ Nothing in his later philosophy treats such an experience as irrational merely because it is not a syllogism.

The academic project took shape around 1980. Plantinga delivered a paper titled "The Reformed Objection to Natural Theology," published that year in the Proceedings of the American Catholic Philosophical Association, which drew on the Reformed theological tradition, beginning with John Calvin, for the idea that belief in God need not be held on the basis of argument.¹² The 1981 Noûs paper followed, and in 1983 Plantinga and Nicholas Wolterstorff edited Faith and Rationality: Reason and Belief in God. The volume included Plantinga's long essay "Reason and Belief in God," Wolterstorff's "Can Belief in God Be Rational If It Has No Foundations?", and William Alston's "Christian Experience and Christian Belief," among others.¹³ The label "Reformed epistemology" stuck because its two leading founders, Plantinga and Wolterstorff, came from the Reformed (Calvinist) tradition and drew on it (Alston, an Episcopalian, was a close ally rather than a Calvinist), though, as we will see, its core claim does not require taking sides in the debates between Reformed, Catholic, and Orthodox Christians.

The early discussion was framed in terms of justification and rationality: is the believer within her intellectual rights? In the 1990s Plantinga shifted the question. In Warrant: The Current Debate and Warrant and Proper Function (both 1993) he developed an account of warrant, the property that turns true belief into knowledge. Roughly: a belief has warrant when it is produced by cognitive faculties that are functioning properly, in an environment suited to them, according to a design plan successfully aimed at truth. Memory, perception, and reasoning yield knowledge when they work as they are supposed to, in conditions for which they are suited.¹⁴

The de jure and the de facto questions

This framework came to full development in Warranted Christian Belief (2000). Plantinga distinguished two kinds of objection to Christian belief. A de facto objection says the belief is false: God does not exist, Jesus did not rise. A de jure objection says the belief is irrational, unjustified, or unwarranted whether or not it is true: that believers have no right to their belief, or that it is the product of wish-fulfilment (Freud) or ideology (Marx), and so does not deserve to be taken seriously. De jure objections seem to let one dismiss belief without engaging the hard question of whether God exists.¹⁵

Plantinga's central argument is that this separation cannot be maintained. A believer who has reflected carefully and still finds her belief compelling violates no intellectual duty, so she is not unjustified in that sense. The serious de jure question is whether her belief has warrant. But whether it has warrant depends on what produced it and whether those processes are aimed at truth. If God exists and has made human beings to know him, it is quite likely that he has given them faculties by which they can come to believe in him, and in that case belief in God, produced by those faculties, would very likely have warrant. If God does not exist, belief in God is probably produced by something like wish-fulfilment, and probably lacks warrant. So the de jure question is not independent of the de facto question. To show that Christian belief is unwarranted, the critic has to show, or at least give reason to think, that it is false.¹⁵ That is the project's main payoff: on that account, it removes the option of dismissing belief as irrational while declining to argue that it is untrue.

The Aquinas/Calvin model

To show how belief in God could have warrant, Plantinga offered his Aquinas/Calvin model (the “A/C model”).¹⁶ It is named for two figures who, in Plantinga's reading, both teach that human beings have a natural knowledge of God. In the opening chapters of his Institutes, John Calvin holds that "by natural instinct" there exists in human minds "some sense of Deity," given by God so that no one could plead ignorance.¹⁷ Thomas Aquinas, centuries earlier, wrote that "to know that God exists in a general and confused way is implanted in us by nature" (though he adds at once that this is not yet to know absolutely that God exists, which he held must be shown from God's effects).¹⁸ Plantinga's model proposes that God has created human beings with a faculty, which, following Calvin, he calls the sensus divinitatis (the sense of divinity). In a wide range of circumstances (the glory of the night sky, the experience of danger or guilt or gratitude) it produces beliefs about God directly, without inference. If the model is true, those beliefs are properly basic and can have warrant, and when they are held firmly enough and are true, they can amount to knowledge.

The model includes the claim that this faculty can be impaired. On Plantinga's account, sin has cognitive as well as moral effects, so that the natural awareness of God can be dimmed, distorted, or suppressed＊A model of human nature, not a verdict on your neighborIs sayingIn Plantinga's model, a God-given capacity to know him is part of human nature and can be hindered by sin. Christian traditions broadly agree that sin affects how we see God, though they describe the extent differently.Not sayingNot that unbelievers are stupid, dishonest, or irrational, and not that anyone can diagnose a particular person's unbelief as a moral failure. The model is offered to show how belief could be warranted, not to pass judgment on those who do not believe..¹⁹ This is a point on which Christian traditions agree in substance while differing in emphasis; the Catechism of the Catholic Church, for instance, teaches that the human mind is "hampered" in attaining truths about God, including by "disordered appetites."²⁰ How far that damage reaches is a matter on which Reformed, Catholic, and Orthodox theologians have long disagreed, and this essay does not adjudicate it. Plantinga then extends the model to cover distinctively Christian beliefs (the Trinity, the incarnation, the atonement, the resurrection) through Scripture and what, following Aquinas, he calls the internal instigation of the Holy Spirit.²¹

Plantinga does not claim to have shown that the model is true. He claims that it is possible, that there are no good objections to it that do not presuppose that Christianity is false, and that if Christianity is true, then the model, or something close to it, is very likely true as well. We will return to the significance of that conditional, because the most sophisticated critics have pressed exactly there.

The strongest objections, taken at full strength

1. The Great Pumpkin objection

The first objection is the most famous, and Plantinga took it up himself. If belief in God can be properly basic, without argument, why not any belief at all? Why couldn't Linus, in the Peanuts comic strip, hold as properly basic his belief that the Great Pumpkin returns every Halloween? The objection's force is that Reformed epistemology seems to open the gate to any belief at all: astrology, the Great Pumpkin, or whatever anyone happens to feel strongly about. If "it's basic for me" is a sufficient answer, then anything goes.

Plantinga's reply had two parts. First, rejecting classical foundationalism does not mean having no standards at all. We do not need an all-purpose criterion of proper basicality, worked out in advance, to know that some beliefs are properly basic and others are not. Instead, as he put it, "criteria for proper basicality must be reached from below rather than above": we begin from clear examples (the remembered morning coffee, the perceived tree, the friend's evident sadness) and test proposed criteria against them.²² Second, there is a relevant difference between belief in God and belief in the Great Pumpkin. The Reformed epistemologist can hold with Calvin that God has implanted in human beings a natural tendency to see his hand in the world, whereas, in Plantinga's words, there is "no Great Pumpkin and no natural tendency to accept beliefs about the Great Pumpkin."²²

Notice, though, that the second reply depends on the truth of theism. Whether there really is a natural tendency to believe in God, aimed at truth, is part of what is in dispute. That observation is the seed of the stronger objection that follows.

2. The "Son of Great Pumpkin" objection

The objection in its most serious form was developed by the philosopher Michael Martin and sharpened by Keith DeRose of Yale. Martin argued in Atheism: A Philosophical Justification (1990) that Plantinga's method could be used by any community. Voodoo practitioners, for example, could begin "from below" with their own examples of properly basic belief, build criteria around them, and declare their beliefs rational in exactly the way Plantinga declares his. The result, Martin argued, is a kind of relativism, in which any belief system can be put beyond rational criticism by declaring its central tenets basic.²³ Plantinga named this version the "Son of Great Pumpkin."

DeRose's version is sharper still. In comments on Warranted Christian Belief delivered in 1999 under the title "Voodoo Epistemology," he argued that Plantinga had construed the objection too weakly. The real worry is not that Plantinga must call voodoo rational. It is that his central strategy, giving a model on which a belief would be warranted if it were true, is available to the adherents of almost any belief system. If nearly any worldview can produce such a model for itself, then producing one does nothing to distinguish Christianity from its rivals, even the most implausible of them.²⁴

Plantinga's reply in Warranted Christian Belief was, in substance, that the existence of a parallel model for some other belief does not show that this other belief is warranted. It shows only that, for that belief too, the question of warrant cannot be settled apart from the question of truth, which is exactly his thesis.²⁵ And not every belief system can produce such a model. Some worldviews, if true, would give their adherents reason to distrust their own cognitive faculties. Plantinga argues that some worldviews, if true, would give their adherents reason to distrust their own cognitive faculties; that is the point of his evolutionary argument against naturalism, a contested argument which our essay on the argument from reason treats in detail.²⁶

Let the critic have the last objection plainly: even granting all that, the de jure defense does not tell an outsider which of the many belief systems with such models is true; as a tool for choosing between worldviews, it can do little: it may rule out views that undercut their own faculties, but among those that can produce such a model it cannot pick the true one. Our reply is that this is correct, and it should be said without embarrassment. The defense is a shield, not a sword. It answers the charge that belief in God is irrational regardless of whether God exists; it was never meant to show that Christianity rather than its rivals is true. The critic has not found a hidden flaw; he has located the defense's stated boundary. Beyond it the conversation moves to the de facto question, where the believer has a great deal to say, as the closing section of this essay sets out.

3. Religious diversity as a defeater

The next objection concerns religious diversity. Suppose the believer grants that her belief in God was properly basic when she formed it. She then learns that millions of thoughtful, sincere people in other traditions hold, with equal conviction and by what seem to them equally direct means, beliefs incompatible with hers. Some take ultimate reality to be impersonal; some deny that there is a God at all. Can she, aware of all this, go on believing without arbitrariness? John Hick argued that the facts of diversity are best explained by taking the great traditions as culturally conditioned and, in his view, comparably authentic responses to a single ultimate Reality, none of which grasps it as it is in itself.²⁷ Philip Quinn argued, more modestly, that reflection on diversity should lead believers toward "thinner" theologies, holding fewer distinctive claims, and with less confidence.²⁸

Plantinga answered in "Pluralism: A Defense of Religious Exclusivism" (1995) and again in Warranted Christian Belief.²⁹ His central points were these. Holding one's own religious beliefs to be true, and incompatible beliefs false, is not in itself arrogant or irrational; it is simply what believing something involves. Some form of exclusivism is also inescapable. The pluralist believes that his own view is correct and that the many believers who reject it are mistaken, and he holds that view in the face of disagreement as deep as any the believer faces. If disagreement among sincere, intelligent people automatically defeated belief, it would defeat the pluralist's position too, along with most positions in philosophy and politics. So awareness of diversity, Plantinga concluded, need not be a defeater for the believer.

We think that reply holds as far as it goes (pluralists reply that their view is a second-order hypothesis, not a rival creed; the exchange continues), and we add an honest concession. Diversity does reduce what basic religious belief can do as public evidence. The believer's own warrant may be untouched, but her neighbor in another tradition can say the same about his, and neither can hand over the experience for inspection. Our essay on religious experience reaches the same conclusion: the traditions offer a shared report of encountering something, not a shared object, and they do not show that the traditions met the same God under different names. Diversity is therefore a reason to go beyond basic belief to the public evidence, and in particular to the claim that God has made himself known in a particular, historical person (John 1:18).

4. The problem of evil as a defeater

This objection deserves to be approached with care, because for many people it is not an abstract puzzle but a wound. The reality of suffering, much of it horrifying and apparently pointless, is the hardest thing a believer faces, and no one should pretend to a tidy explanation of it. William Rowe gave the objection its most influential modern form: there appear to be instances of intense suffering that an all-powerful, all-knowing, wholly good God could have prevented without losing any greater good, so it is reasonable to believe there are such instances, and therefore reasonable to believe that no such God exists.³⁰ Applied here, the objection says: even if belief in God was properly basic for the believer, once she becomes aware of the evidential argument from evil, it serves as a defeater.

Plantinga's reply in Warranted Christian Belief is that whether a belief is defeated depends on how strong its grounds are compared with the force of the objection.³¹ A belief with a high degree of warrant can withstand an argument whose premises are less certain than the belief itself. And the crucial premise in Rowe's argument, the step from we cannot see a reason that would justify God in permitting this to there probably is no such reason, is precisely the one many philosophers dispute. If God exists, it would not be surprising that some of his reasons lie beyond our sight. This is a contested reply, not a knock-down one, and our essay on the problem of evil treats the debate at length.

Something else should be said, which philosophy alone does not say. The Christian believes that the eternal Son of God took our human nature, suffered, and was crucified, and that in raising him from the dead God showed that suffering will not have the last word. That does not dissolve the mystery of why particular evils are permitted. It does mean that her grounds for trusting God include a story in which God, in the person of the Son made man, entered our suffering rather than standing apart from it.

5. "This is just fideism," or "a conversation-stopper"

Another objection is less technical but very common. Reformed epistemology, critics say, is fideism in academic dress: a way of saying "I just believe" and refusing to engage. If belief in God is properly basic, the believer can simply announce that she needs no reasons and end the discussion. That looks like a refusal of the very intellectual accountability Clifford was trying to defend.

The charge has a point about a possible misuse, but it misdescribes the view. Plantinga, discussing the charge, takes fideism to be "exclusive or basic reliance upon faith alone, accompanied by a consequent disparagement of reason."³² Reformed epistemology does not disparage reason. It holds that belief in God, on the A/C model, is produced by a cognitive faculty working as it should, in the same broad category as memory and perception, which are paradigm sources of rational belief. It holds that basic beliefs are defeasible and must answer serious objections. And its founders spent their careers engaging arguments: Plantinga's own work includes the free-will defense, the modal ontological argument, and the evolutionary argument against naturalism. A sharper version of the charge is that the view makes belief immune: a believer can always claim her basic warrant outweighs any objection. But on Plantinga's account the strength of that warrant is not hers to declare; it depends on whether her faculties are in fact working as they should, and a believer who is wrong about that has no protection. Defeasibility is real, not nominal. Critics reply that this safeguard operates out of the believer's sight, which is part of why the internalist objection noted below remains live.

The misuse, however, is real, and the believer should own it. "It's properly basic for me" can be used to close a conversation that ought to stay open, which is a failure of charity and of witness. Scripture asks believers to "be ready always to give an answer to every man that asketh you a reason of the hope that is in you, with meekness and fear" (1 Peter 3:15). Reformed epistemology and 1 Peter 3:15 fit together. The first says that the believer's faith does not wait on arguments in order to be rational. The second says that when someone asks, she should be ready to offer reasons anyway, as a service to the one who asks.

6. "It only shows that if Christianity is true, it's warranted"

The final objection goes to the heart of the project. The A/C model shows, at most, that if Christianity is true, Christian belief is probably warranted. But the naturalist can produce the mirror image: if naturalism is true, religious belief is probably produced by mechanisms not aimed at truth, and so probably lacks warrant. Everything turns on which worldview is true, and on that question the A/C model is silent. Evan Fales, in a detailed critical study of Warranted Christian Belief, frames the central question as whether Christian beliefs are produced by defective belief-forming mechanisms, which is to say that the de facto question has returned and is still open.³³

The description should be granted in full, because it is what Plantinga set out to do; the inference that the project is therefore empty should not be. He was explicit that Warranted Christian Belief does not argue that Christian belief is true; its target is the claim that Christian belief is unacceptable whether or not it is true.³⁴ But the conditional is not trivial. It answers a whole family of objections (the familiar complaint that belief in God is irrational, childish, or intellectually irresponsible, regardless of whether God exists) by arguing that each depends, in the end, on the claim that God does not exist. After Plantinga, a critic who wants to say that belief in God lacks warrant must, in most cases, argue that it is false; what remains are defeater objections, which either argue falsity directly (evil) or press on the believer's epistemic situation (diversity), and that is where the live debate now sits (internalist evidentialists also contest the framing; see below). It also means that Reformed epistemology must not be overstated by its friends: it does not show that God exists, only that the question that really matters is the question of truth.

Natural theology and basic belief

Because the movement carries the name "Reformed," it is easy to assume it pits one Christian tradition against the Catholic and Orthodox respect for natural theology. That would be a mistake, and this essay takes no side in that intra-Christian debate. The First Vatican Council taught in 1870 that "God, the source and end of all things, can be known with certainty from the consideration of created things, by the natural power of human reason," citing Romans 1:20; it added that through revelation such truths can be known by everyone readily, with firm certainty and without error.³⁵ Thomas Aquinas, whose name stands beside Calvin's in Plantinga's model, held that God's existence can be demonstrated. He also observed that if the truth about God had been left to unaided reason, it "would only be known by a few, and that after a long time, and with the admixture of many errors," which is why revelation was fitting.³⁶ Aquinas, in other words, did not expect most believers to hold their faith on the strength of demonstrations. In the East, John of Damascus taught in his Exact Exposition of the Orthodox Faith that "the knowledge of God's existence has been implanted by Him in all by nature," and two chapters later he set out arguments for God's existence from change and from the order of the world.³⁷ He saw no tension in holding both.

Catholic philosophers engaged Reformed epistemology early and in depth; the 1993 volume Rational Faith: Catholic Responses to Reformed Epistemology, edited by Linda Zagzebski, collected both appreciation and criticism, along with new directions for defending natural theology.³⁸ Within the Reformed tradition itself, Michael Sudduth has argued at book length that the tradition was, from its first generations, broadly favorable to natural theology, and that the main "Reformed objections" tell at most against particular models of it.³⁹ And Plantinga, as we will see, valued the theistic arguments highly.

So there are real differences of emphasis among Christian traditions, about how far unaided reason can go, how deeply sin affects our knowledge of God, and what role arguments should play in faith. We note them and leave them where they lie. The common ground is wide: the main Catholic, Orthodox and Reformed traditions hold that God can be known through what he has made (Romans 1:19–20), though some Reformed theologians, notably Karl Barth, have been sharply critical of natural theology; that ordinary believers are not irrational for believing without philosophical proofs; and that reasoned argument has a genuine and honorable place. Many on both sides now treat properly basic belief and natural theology as complementary ways of describing how God makes himself known; where real differences remain, this essay does not adjudicate them.

The state of the scholarship

First, the critique of classical foundationalism has been very widely accepted; in our judgment few epistemologists today defend the strict version Plantinga attacked. Second, Reformed epistemology has become a mainstream position in the philosophy of religion, with its own literature of refinements and objections. Andrew Moon's 2016 survey in Philosophy Compass, for example, reviews work on its relation to religious debunking arguments, to the cognitive science of religion, and to questions about which beliefs count as basic.⁴⁰ Third, the debate has not been won. The Great Pumpkin family of objections, in Martin's and DeRose's forms, remains, in our reading of the literature, the most discussed challenge, and critics such as Fales, Quinn, and Hick represent serious, sustained dissent. Internalist epistemologists, including evidentialists such as Conee and Feldman, reject the externalist account of warrant on which the later version of the view depends.

The contested hinges should be labeled as contested. Whether there is a sensus divinitatis philosophy cannot settle; on Plantinga's own account it stands or falls with theism. Whether religious diversity reduces the warrant of basic belief, and by how much, is disputed, as is whether warrant should be understood externally or internally. What is far less contested is the narrower point the movement was built to make: that the demand that every rational belief in God be based on argument rested on a theory of rationality too strict to survive (it would condemn memory, perception, and belief in other minds) and, many argue, unable to meet its own standard.

What it does, and does not, establish

Our verdict, stated plainly: Reformed epistemology does establish that belief in God can be rational, and on Plantinga's account can be warranted and even knowledge, without being based on argument. It answers the classical form of the evidentialist objection by exposing the classical foundationalism behind it as too strict and, on Plantinga's argument, self-defeating; broader evidentialisms survive, but no longer demand an argument. Through the de jure and de facto distinction, it makes a strong case that, on Plantinga's account of warrant, objections to the rationality of Christian belief depend, in the end, on showing that belief to be false. And it describes well how most believers actually hold their faith: not as the conclusion of a syllogism but as a response to God's self-disclosure in creation, conscience, and Scripture. The woman kneeling by her bed is not Clifford's shipowner. He suppressed evidence he had; she is responding to what she takes herself to perceive, and she remains answerable to real objections when they come.

Reformed epistemology does not prove that God exists. It does not tell an inquirer which God is real, or whether the Christian account is true rather than a rival one; its central conditional is explicitly silent on that question. Even granted in full, its general argument reaches only the rationality of belief in a personal Creator, not yet the triune God of the creeds; it does not by itself establish the Trinity, the incarnation, or the resurrection. Plantinga's extended model shows how such beliefs could be warranted if they are true, but whether they are true has to be argued on other grounds.

That is why it is best understood as one strand in a cumulative case, and its founder thought so. In lecture notes from a 1986 summer seminar, "Two Dozen (or So) Theistic Arguments," Plantinga sketched a long list of arguments for God, from intentionality, numbers, physical constants, morality, beauty, and more, which he thought were good arguments even though belief in God does not depend on them; the notes were later published, and in 2018 each argument was developed by other philosophers in Two Dozen (or So) Arguments for God.⁴¹ The believer may hold her faith without arguments and still be grateful for them. Our other essays take up those strands: the kalam argument (whatever begins to exist has a cause), the fine-tuning argument (the data widely accepted, design inferred and contested), the moral argument, and the ontological argument, whose modest conclusion, on Plantinga's own reckoning, is the rational acceptability of theism rather than its proof. For the specifically Christian claim, the decisive question is historical: did Jesus of Nazareth rise from the dead? That case begins with the creed Paul hands on in 1 Corinthians 15:3–7, which many scholars date to within about two to five years of the crucifixion, and it is set out in our essay on the minimal facts argument for the resurrection.

Clifford was right that how we believe matters, and right that suppressing doubt is a failure of integrity. He was wrong about what integrity requires. It does not require a person to prove the existence of other minds before loving her family, or to complete a course in natural theology before she may thank God for the day. It requires her to be honest, to keep listening, and to give a reason for her hope when someone asks, "with meekness and fear." On the narrow charge that belief in God is irrational without an argument, she can answer with a clear conscience. On the larger question of whether her belief is true, she has more to say, and she can say it gladly.