Hmmm, this seems to be a pattern...
I am open to any evidence of the existance of a god, rather than evidence that there are / have been people who believe in god. The Heaven's Gate incident provided ample--and recent--proof that people will live by, and die for, their unsupported beliefs.
I don't understand the "what does an atheist say god is?" ploy. An atheist says, I don't believe in any kind of supernatural, superpowerful, immaterial, eternal or omniscient being(s). Most religions' god(s) have at least one of those attributes, so it's simple to reject the whole lot.
There is a natural, material, bounded world. It works in consistent and determinable ways, which we codify our understanding of as various "Rules" and Theories of science: Thermodynamics, chemistry, physics, biology, etc. These are tools we use to better understand and make useful predictions about, the nature of Existance.