God is intangible, unknowable and ineffable. Except when he isn't.

I am so tired of presuppositional arguments, whether or not they're acknowledged as such. One of the fundamental flaws I criticize about religious belief is when believers want their cake and eat it too. More to the point, their arguments rely too heavily on special pleading. And no, adding caveats to the definition of a god does not bypass special pleading.

For example: if a god does not leave any traces for us to observe, then we have no reason to assume that anything we see supports the existence of this god. If this god is unknowable and incomprehensible, then we have no reason to assume anyone understands anything about it and can accurately represent it.

So which is it? Is a god knowable or not? If not then the discussion is closed. If so then show us examples that clearly demonstrate how this knowledge is valid and not human bias.