Hmmm... I wanted to say something clever. Something like "What would happen if god and atheism walked into a bar?" I mean, would the universe implode or something? Or how would anyone define atheism if there wasn't even a question about whether there was a god/being. Imagine there's no heaven, it isn't hard to do. Nothing to kill or die for, and no religion too...
I consider myself an atheist. But I also consider myself (and this is more important as far as world peace is concerned) an anti-theocrat. I rememeber a few years ago some atheists were throwing around the word "brights", which is nice enough but maybe not as definite as atheist. When my theist friends ask how to describe my beliefs (should anyone ask) I tell them to call me a raging atheist --- that way I circumvent all the wonderous christian arguments for belief in a god.
But I also like to label myself as a non-believer. I find that non-believer gives pause to the conversation. A long enough pause for me to skeedaddle---