BTW, God is not the arbiter of right or wrong, as theologians and philosophers have been pointing out for millennia. If someone said God told him to slaughter all the inhabitants of your town, would you consider him right simply because of his claims?
If someone chooses to be a atheist, that's his right. If he wants to talk about why he's a atheist, or why he feels that atheism is right, that's his perogative. However, I don't understand why some aggressively try to proselytize atheism. With religious people, it's easy to understand. After all, they belive they're saving souls, helping them get to heaven. Atheists, however, don't believe in God or heaven...so why bother?