A lot of atheists just like to bash theists. Probably most of the users on here joined to say how much religion sucks. I'm not saying this is the reason everybody hates on atheists, but I'm sure it doesn't help. Everyone would hate an atheist even if they were nothing but tolerant and accepting. It's just not good for politics to like an atheist. It's hard not to return the hate cast upon you.
Fact: Jesus smoked - http://www.jesuspipes.com