Atheism is the belief that there is no God. That belief is based on faith, not evidence- so atheism is also a religion.
I realise that this has been refuted already, but I thought I should add:
You're making a definitional mistake and therefore constructing a strawman. Not all atheism makes the positive claim that there is no God. Most atheists do not believe in God's existence because there is no reason to do so.
Do most atheists believe in the big bang? because there's no reason to do that either.
There IS reason. The galaxy groups nearby all show movements like originating from a single point. Background radiation is also hints a centre point.
I myself, don't believe it happened to ALL the universe. It might have been a 'local' event as well.
Recent studies actually strengthen this idea, by hinting at a point outside of the detectable area towards some galaxy groups converge.
So, i think the universe is even bigger than we see, and the big bang is just a perceived event based on this limited perception.
But i'm not a scientist, so there could be other facts I missed while drawing this conclusion.
But i know a few things: if there is a God, it is not a male gendered entity as God knows NO sex
If God created anything, it created this whole universe, and doesn't give a s..t what happens right here.
There are gazillions of other places where intelligent life developed, is, or will develop in the future.
Actually, i wish there is a God closer to our lives, it would enable a lot of 'supernatural possibilities'.
But I think anyone who perceived it just got one more gene in some brain defining area. (I'm not calling they are nuts, but nutters got those too, just even more).