Just starting here, but I want to grow myself a list of atheist slogans!
Atheism: You don't have to read any books!
Atheism: All the premarital sex, None of the guilt.
Atheism: We can dig science, even when we're not sick
Atheists: We DON'T think you're going to hell
Atheism: Because self righteousness if more fun when you're right!
More to come...