I wouldn't try to prove there is no God. I'd only say one way or another, it doesn't matter. Would I change a single thing in my life if he existed? No! Would he, if he exists and there's an afterlife send me to hell for not recognizing his existence? I'd say I'd be better off in hell to be with such a petty God.

As it is, my understanding of the human life is that once your brain is gone, you are no more.