why is there even a word to describe non believers?

[Confused Ape]

well, let me clarify my point. Based on my personal experience, I can tell you that god does not exist! Furthermore, there is a logical, rational, and systematic explanation for the origins of religious beliefs, namely, cognitive, social and biological mechanisms. Given these undeniable and incontrovertible proofs for the non existence of god,

Spectrum of Theistic Probability - Dawkins Formulation

Dawkins argues that while there appear to be plenty of individuals that would place themselves as "1" due to the strictness of religious doctrine against doubt, most atheists do not consider themselves "7" because atheism arises from a lack of evidence and evidence can always change a thinking person's mind. In print, Dawkins self-identified as a '6', though when interviewed by Bill Maher[3] and later by Anthony Kenny,[4] he suggested '6.9' to be more accurate.

If you have incontrovertible proof of the non existence of god I'm sure Richard Dawkins would love to hear it.

non belief in god is sane, rational, and realistic. So instead of calling yourselves atheists, call yourselves sane people

If an atheist told you they'd been abducted by aliens or claimed to be a famous person from history, would you class him/her as being sane, rational and realistic?