An atheist would bet their life against the existence of a (specificaly defined) god, in the same way they bet their life every time they walk out the front door in sunny San Diego that they will not be attacked by a polar bear while being struck by lightening, shot in the head, and dissemboweled by a misplaced samurai who'd been frozen in a freak boating accident and recently thawed and released by a secret group of deranged cryogenesists. _Prove_ to me that this absolutely can't happen when I walk out the door today. In fact, it's considerably more likely than most definitions of god.