An atheist is somebody who lacks belief in god(s). Atheists do not have to prove there is NO god(s) in order to lack the belief that they exist.
According to the chap who wrote "the god that wasn't there" the only unforgiveable sin, according to Christianity, is denying the existence of the Holy Spirit, in thought or word. The poor chap was terrified for decades he's "accidentally" done this at some point and would be damned to eternal torture as a result! THANKFULLY he saw the light in his mid thirties and is now an atheist.
According to the chap who wrote "the god that wasn't there" the only unforgiveable sin, according to Christianity, is denying the existence of the Holy Spirit, in thought or word. The poor chap was terrified for decades he's "accidentally" done this at some point and would be damned to eternal torture as a result! THANKFULLY he saw the light in his mid thirties and is now an atheist.