Because they have forgotten the fact that according to their religion, God is the only one who needs to worry about other people believing.\n\nI am also an atheist. I have no problem with people practicing religion, or even talking about religion- but when people tell me that I'm wrong, I get pretty angry. Even if I am wrong, and God does exist, I'm going to hell and you're not going to have to deal with me when you're all the way up in heaven.\n\nSome atheists are guilty of that too, though, and it pisses me off just as badly. Live and let live.