I think this exactly the problem with most arguments about God. People rarely state a definition of what constitutes a God. As far as I am personally concerned, a God who is not omniscient and omnipotent is no God at all; it's just a much more powerful being.

People sometimes choose to associate the Universe itself with God in the way Carl Sagan occasionally suggested (whether Mr. Sagan believes this entirely, I do not know) but I think at that point it's a question of naming. I call it Universe, someone else calls it God.