The Argument from Religious Experience

The argument from religious experience is the most direct of the theistic arguments: it bypasses inference from the world's existence or order and appeals to the apparently first-hand awareness of God reported across cultures and centuries — the mystic's union, the convert's sense of presence, the worshipper's encounter with the holy. If, in such experiences, people genuinely perceive God much as they perceive trees and tables, then religious experience is evidence for God in the same way ordinary perception is evidence for the physical world. The argument thus turns on a question in the epistemology of perception: when, if ever, may an experience be taken at face value as putting us in touch with its object?

This page distinguishes the kinds of religious experience, gives the two main forms of the argument (Swinburne's Principle of Credulity and Alston's perceptual model), and weighs the major objections — naturalistic explanation, the conflicting claims of different traditions, and the disanalogies with ordinary perception. (The argument lives here; the broader epistemology of mysticism — perennialism vs. constructivism, the nature of ineffability — is developed in the epistemology section.)

Varieties of religious experience

"Religious experience" is a broad category, and the argument's prospects vary with the type:

• Numinous experience (Rudolf Otto, The Idea of the Holy): the awe-struck sense of the mysterium tremendum et fascinans — a reality wholly other, overpowering and dreadful yet compelling and fascinating. The experience of a personal presence over against the self.
• Mystical experience (William James, The Varieties of Religious Experience): typically union or absorption, often described as ineffable (beyond words), noetic (carrying knowledge), transient, and passive. James found these the experiential core of religion. Mystical union may be extrovertive (perceiving unity through the world) or introvertive (a contentless unity reached by emptying the mind).
• Interpretive / regenerative experience: ordinary events (a sunset, a recovery, a moment in worship) experienced as God's action — answered prayer, providence, conversion, the sense of being forgiven or sustained.
• Quasi-sensory and revelatory experiences: visions, voices, a felt "word." (These are the easiest to explain naturalistically and the weakest evidentially.)

The most evidentially interesting are the perceptual cases — those that present themselves not as feelings about God but as awareness of God — because only these can be modelled on perception.

Swinburne's Principle of Credulity

Richard Swinburne (The Existence of God) grounds the argument in a general principle of rational epistemology — not a special pleading for religion, but the very principle without which all knowledge collapses:

Principle of Credulity. If it seems to a subject that $x$ is present, then probably $x$ is present — in the absence of special considerations to the contrary. How things seem is prima facie good grounds for how they are.

Without such a principle we could never trust perception, memory, or testimony at all: a blanket scepticism about appearances is self-defeating. But the principle is general; it cannot be applied to sense-perception and arbitrarily withheld from religious experience without bias. So the vast number of experiences that seem to be of God are prima facie evidence that God is present — defeasible, but real. Swinburne pairs it with a Principle of Testimony (others' reports of their experiences are prima facie to be believed), which lets the experiences of the many count as evidence for all. He then catalogues the "special considerations" that could defeat a particular seeming and argues that, for religious experience in general, none succeeds decisively — so it stands as genuine, if not conclusive, evidence, and contributes a strand to the cumulative case.

Alston's perceptual model

William Alston (Perceiving God, 1991) develops the perceptual analogy with care. He argues that Christian mystical practice ("CMP") — the socially established doxastic practice of forming beliefs about God on the basis of experience — is epistemically on a par with sense-perceptual practice ("SP"):

• Both are socially established, self-supporting, internally consistent doxastic practices that we engage in without being able to give a non-circular justification of their reliability (famously, we cannot validate sense-perception without using sense-perception — the attempt is circular).
• Since we cannot non-circularly establish the reliability of any basic doxastic practice, it is rational to take an established practice as innocent until proven guilty — to accept its outputs as prima facie justified unless it is shown unreliable.
• SP and CMP are in the same boat: both are firmly established practices lacking external validation. To accept SP while rejecting CMP is an unprincipled double standard ("epistemic chauvinism"). So beliefs formed in CMP — that God is present, loving, addressing me — are prima facie rational.

Alston's is the strongest form of the argument because it does not claim mystical perception is as reliable as sense-perception, only that it cannot be dismissed by any standard that does not also condemn ordinary perception.

The objections

1. Naturalistic explanation

The experiences plainly occur; the question is whether their cause is God or something within the subject. Naturalistic candidates abound: neurological correlates (temporal-lobe activity, the effects of psychedelics, sensory deprivation, meditation), psychological needs (Freud's wish-fulfilment — the projection of an idealised father), and social conditioning. If a complete natural account of why people have these experiences is available — one that would predict the experiences whether or not God exists — then the experiences are explanatorily idle as evidence for God; they are undercut (see the debunking arguments).

The defender's reply distinguishes cause from veridicality: that an experience has a neural substrate shows nothing about whether it is of anything real — all experience, including veridical sense-perception, has a neural substrate, so "it's just brain activity" proves too much (it would debunk perception too). A mechanism of perceiving God is exactly what one would expect if God designed us to perceive him (the sensus divinitatis of Reformed epistemology). The naturalist presses back that the relevant disanalogy is independent checkability (below): we can confirm that visual experience tracks an external world, but have no comparable confirmation that religious experience tracks God rather than the brain.

2. Conflicting claims across traditions

The gravest objection, and the one that most distinguishes religious from sense experience. Mystics do not report the same object: the Christian meets a personal triune God, the Advaitin an impersonal Brahman identical with the self, the Buddhist a non-self and an empty ultimate with no creator God, the theravādin nibbāna. These descriptions are mutually inconsistent. Since they cannot all be veridical as described, the conflict seems to undercut the reliability of the practice generally: if religious experience "delivers" incompatible objects, why trust any of its deliverances? (Compare ordinary perception, where observers across cultures broadly converge on the same external world.)

Replies run in several directions:

• Hick's pluralism (religious pluralism): the experiences are all veridical contacts with one ultimate Real, differently conceptualised through culturally given categories — the Real an sich appearing as personae (God) and impersonae (Brahman, the Dao), much as one thing appears differently through different conceptual schemes. The cost is that the specific claims (a personal God) are demoted to mere appearances.
• Constructivism vs. perennialism (Katz vs. Stace): if experience is heavily shaped by the mystic's prior concepts (constructivism), the divergence is expected and tells us about interpretation, not about the object; if there is a common core beneath the descriptions (perennialism), the conflict is more apparent than real. (Developed in the epistemology of mysticism.)
• Particularist reply (Alston, Plantinga): one may rationally trust one's own established practice even granting the existence of rivals, just as one may reasonably hold a philosophical or political view one knows to be contested — though Alston concedes the diversity is the "most difficult" problem for his position.

3. Disanalogies with ordinary perception

Even setting aside conflict, critics (Flew, Martin) argue the perceptual analogy fails at crucial points that matter to reliability:

• No independent checks. Sense-perception is cross-checkable — by other senses, other observers, instruments, predictions. There is no analogous independent way to confirm that a religious experience is veridical; the practice cannot be tested against its object.
• No agreed conditions of veridicality. We know the conditions under which vision is reliable (good light, open eyes, normal physiology) and can correct for illusions; there is no comparable theory of when "perceiving God" is reliable versus delusory.
• Optionality and unevenness. Sense-perception is (near) universal and involuntary; religious experience is sporadic, unevenly distributed, and absent for many sincere seekers — which connects to the problem of divine hiddenness.

Alston grants these differences but denies they are defeaters: they show religious perception is different from, and perhaps weaker than, sense-perception — not that it is non-veridical. To demand that CMP meet SP's standards of cross-checking is, he argues, to impose the norms of one practice on another, which begs the question.

Where the argument from religious experience sits

The argument from religious experience converts the inward life of religion into evidence, and at its strongest (Alston) it makes a genuinely awkward demand on the sceptic: produce a principle that discredits the experience of God without also discrediting ordinary perception. Its defensive achievement — that religious experience cannot be cheaply dismissed as "merely subjective" — is more secure than its offensive force as a proof, which is blunted by the conflicting deliverances of the traditions and the absence of independent checks. It is therefore best understood not as a stand-alone demonstration but as the experiential strand of a cumulative case, and as the natural ally of Reformed epistemology, which makes the same move without the perceptual analogy — holding that belief grounded in religious experience can be properly basic even if it is not, strictly, perception. The deeper questions it raises — the nature of mystical knowing and the perennialist/constructivist dispute — are taken up in the epistemology of religious experience.