The misconception thread made me think of this topic. Many people seem to think that atheists are a pretty unhappy and bitter bunch. I used to perceive atheists that way too before I became one myself.
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So what it is about atheism that makes you a happy person in general?

For me it was getting rid of the creepy feeling that someone's constantly watching/judging my every move. And also that there is no such thing as "sin" - I can basically do whatever I want (as long as I don't hurt anyone) without feeling guilty. That has been a big weight off my shoulders.... more than I even realized I was carrying around. If I feel like I can get high, have all sorts of sex with my husband, laugh at silly shit, eat something weird and then wake up on Sunday morning without a worry in the world. Have some more sex, get up and do basically nothing with my day if I don't feel like it. In short, I'm simply free and that makes me happily enjoy life as it is at any given moment. No guilt, no worries, inner peace and no more being a friggin' PRUDE about any- and everything :)