Rach wrote: But I think we all believe in something, if it's only life for itself, the nature, the humans or whatever, then perhaps atheism doesn't exist at all?
This is exactly why I don't think there's no such thing as atheism. By definition, atheism is
–noun 1. the doctrine or belief that there is no God.
2. disbelief in the existence of a supreme being or beings.
If you believe there is no God, then by definition it's atheism. However, you "believe," so how could it be a "non-belief" at all? You do believe in something. It's just that it's not God. Buddhists don't believe in God, but people do call it a "religion." Therefore, atheism, by all means, is a religion to me, a religion of not believing in God.