Athiesm is founded on the premise that there is no god. Its inverse, theism, is founded on the premise that there is a god. Theism is denied because there is no way to prove that there is a god. And it's fairly easy to deny or disprove the existance of a personal, interactive god.
My question is this- can it be proven, conclusively, that there is no god? Or is atheism taking a leap of faith in its key assumption? Remember, just because you can't prove something as true, doesn't mean it isn't. So I request a proof that there is no god, and this proof must be completely a priori, since the instant you bring in experience, I can guarantee a way to find a "god" in your system.