Oh, my bad. Apparently, atheists don't believe in god, but do believe there are gods.
You are missing the entire point.
"I DO NOT BELIEVE IN GODS."
That is the position that there are no gods that exist for me to believe in.
For me to say:
"I BELIEVE THERE ARE NO GODS"
That would be incorrect.
Atheism is, broken down:
A - not or without
theism - belief in a god or gods.
Atheism is without belief in gods. To use the definition "a belief there are no gods" is presupposing the existence of gods, which is incorrect.
So, repeat after me.
ATHEISM IS A LACK OF A BELIEF IN GODS, NOT A BELIEF THAT THERE ARE NO GODS.
If you still don't get it, watch this video.
http://www.youtube.com/watch?v=Bt1wDNRkllQ