Philosphers of religion sometimes appeal to religious experiences as evidence for the existence of God. To take one notable and philosophically sophisticated example, Professor Swinburne argues that religious experience constitutes good C-inductive ground for belief in the existence of God; and that the contribution of the argument from religious experience to the ensemble of arguments for the existence of God as a whole makes the ensemble a good P-inductive rather than just a C-inductive argument. This is a substantial claim: a C-inductive argument merely adds to the probability of some claim, without making it more probable than not. A P-inductive argument, by contrast, establishes that the probability of the claim it defends is greater than fifty percent.
Not all religious experience is covered by Swinburne’s claim. Non-theistic experiences and theistic experiences not claiming to be of God are excluded from this discussion. This article will deal with unequivocal claims to have had experience of God, not with weaker claims (to have had an experience as of God touching one, for example). Weaker claims might be indefeasible, but offer little joy for the theist. Univocal claims, by contrast, are non-trivially true if true at all.
What marks an experience as an experience of God? H.P. Owen’s definition of God as ‘the Creator, who is infinite, self-existent, incorporeal, eternal, immutable, impassible, simple, perfect, omniscient and omnipotent’ is useful in answering this question. A claim to have had an experience of an infinite, eternal, omniscient and omnipotent being, say, is a claim to have had an experience of God: here, a sufficient number of attributes secures the identification.