Bertrand Russell on Proving GodWhy I Am Not a Christian and Other Essays on Religion and Related Subjects (Allen & Unwin, 1957), p. 40.
I do not pretend to be able to prove that there is no God. I equally cannot prove that Satan is a fiction. The Christian god may exist; so may the gods of Olympus, or of ancient Egypt, or of Babylon. But no one of these hypotheses is more probable than any other: they lie outside the region of even probable knowledge, and therefore there is no reason to consider any of them.