"Agnostic" makes the point that God is possible.
Which is about as crazy as believing that God is likely. The not-0%-impossible point applies to God in about the same sense as to Santa Claus. If you want to specifically make the point that Santa Claus is possible, something is still seriously wrong with you, even if you stopped making the mistake of believing that Santa Claus is most certainly real.
As SarahC intimated above, it's very unlikely that a specific deity exists. But when you suggest that the probability of God is so unlikely as to make one crazy to entertain the possibility, I wonder what your definition of 'God' is.
Over the course of writing and revising this comment, I'm recalling that the context of God here on LessWrong is almost always that of an anthropomorphic, personal, intervening, laying-out-rules-you-better-not-break god. But consider how flexible the meaning can be from one context to another. In which case, could Perplexed c...
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