Why are creationists wrong?

I am asking all of those total anti-creationist people out there - what else, besides the arguments for evolution, is there to disprove the existence of a God, or at least the creation by one? Any web search I have tried has only brought up arguments against creationist arguments or evidence for evolutionary processes. Somehow I don't think that the many people out there who believe in God will be swayed by one argument - or by others saying that creationism is "stupid". I am not looking for a debate, but rather for some reasoning that is new to me. However, please keep these in layman's terms; I am not a physicist!