[quote=Protagonist]
As for Atheism not being a religion: I'm going to argue that is.
I have heard that "Not collecting cards isn't a hobby", but not collecting stamps is simply stating the hobby you /don't/ have. 
Atheism is to religion what 'sitting around doing nothing' is to hobbies, or what 0 is to numbers.
Also, it's not like Atheists don't believe anything. To be an Atheist you have to consciously believe that deities don't exist.
[/quote]

If you look at the word "atheist", you see the word 'theist' and the prefix 'a-'. An atheist is someone who is not a theist. So saying you are atheist mans you don't follow any theistic ideals of a god. Like how you say 'asymptomatic', which means you are without symptoms. Likewise, to call an asymptomatic person ill would be like calling an atheist religious without any further knowledge of that person. Sure, there can be religious atheists, just like how asymptomatic persons can be ill, but to call atheism a religion is wrong.

Atheism is a religion if abstinence is a sex position.

(P.S: The reason why atheists don't believe in a god is that there is no evidence that can prove one)