What's the selling point for atheism?

Dinesh D'Souza critiques atheism. I've often thought about what life would be like if we were all atheists. I think it would be a lot like Iraq before we removed Saddam. Without faith, I see no reason for altruism, kindness and other virtues except as tools for manipulating other people. What is your responsibility to others who don't carry your genes? In Darwinian terms, we've probably evolved to believe in a higher reality, because death would be too frightening, societies wouldn't hold together, and there'd be no reason to live, love and strive. Once we realized that we're all rats in a maze, all the sweet memories and little victories would resolve into self-deception and delusions. I suspect that is why we have a problem with teenager suicides.