On the other hand a person can know God exists. All that has to happen is a) for God to exist (possible) b) for God to reveal himself to a person (also possible)
I have read that it has been found possible to evoke religious experiences by electrical and chemical means (I don't have references available just now, but will look for them if required). Given that, I don't see how one could be confident that such experiences, which I suppose include God revealing himself, can be relied on without external confirmation.
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