There are better bumaults on Creationism specifically, but pulling the rug with an argument against the existence of god also works… I’d like to see a god that can create anything whilst not existing.

Heh… reminds me of a parody of the “Greatest Conceivable Being” (aka Ontological) argument. The original argument says that god is the greatest conceivable being, and that it is greater to exist than to not exist, so therefore god must necessarily exist. It’s horribly flawed in a lot of ways, but the parody is quite neat too:

If god is the greatest conceivable being, then his creation (of the universe) must be the greatest conceivable creation. We measure the greatness of created things (e.g. works of art) by how difficult it is to create them, the skill demonstrated in creation, and the merits of the resulting creation. It is far more difficult to create something when you do not exist than when you do exist, therefore for the universe to be the greatest conceivable creation, and hence for god to be the greatest conceivable being, god must not exist.

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[EDIT] I saw your point better the second time I read it; an argument against god on the basis of incompatible traits (the omni’s) only works if you believe in a god with those traits, so you could still be a creationist by believing in a different god.

If I wanted to refute you from that position I’d look to the other arguments against creationism. That or ask what kind of god you do believe in, to form an argument against that kind of god existing.