Hitler didn't burn no fucking bibles, Hitler was a devoted christian.
Also, there are plenty of reasons to live a good life besides pleasing some imagined omnipresent deity. What you do in your lifetime will affect the lives of those you touched long after you die...that's more than enough of a reason to make the most of your time here by doing good for others, and you don't need to believe in any religion to know that. In fact, all religion really does is attach a bunch of myths and supernatural junk to what's already common sense.
If is a person is so utterly dependant upon your belief in the presence of an omnipresent deity tantalizing people with rewards (or conversly, punishment) in an afterlife that he/she would go as far as to end their life when faced with the idea that it might be all in their head, then quite frankly, they have more problems than I'd care to discuss in this thread.
(If the only thing that's keeping them from turning into an apathetic self-indulgent suicidally depressive angst machine or a full-blown rapist/serial murderer is their religion, then they need professional help beyond anything that I could offer.)
In fact, I should mention that many religious folk exert the same detached "all or nothing" logic. Wherein if they didn't believe in their chosen religion, they'd lapse into apathy/immorality/etc. since they truly believe that without a deity, they'd have no reason to not be a total asshole. Being so utterly dependant upon their religion, they perceive that the only possible alternative would be nihilism, and therefore, they would not be able to function as a person outside of their religion.
Not only is this mode of thinking completely self-centered (in that they can't see that there are already many people who don't believe in religion, and are able to function just fine) but it's also this sort of circular logic that keeps them from ever attempting to critically evaluate their own beliefs in relation to others, keeping them bound to the more implausible aspects of their faith beyond reason.
BTW: Creationists use exactly the same way to argue as holocaust deniers and their arguments make just as much sense.