The argument goes something like this: 'I refuse to prove that I exist.' says God, 'for proof denies faith, and without faith I am nothing.' 'But says Man, 'the Bable fish is a dead giveaway, isn't it? It could not have evolved by chance. It proves you exist, and therefore by your own arguments, you don't. QED' 'Oh dear,' says God, 'I hadn't thought of that,' and promptly vanishes in a puff of logic. 'Oh, that was easy,' says Man, and for an encore goes on to prove that black is white and get himself killed on the next zebra crossing.