Is atheism a belief?

[Catharsis]

I could go a step further saying, is there really any other type of belief?

How is belief in something proven? Doesn't the mouth speak what the heart is full of?

Good point!

People here may want to separate belief and knowledge. Normally what they mean by this is that knowledge is something I hold to be true based on reasons I think are good ones, and belief is something someone else holds to be true based on reasons I think are bad ones. 

But I think you're closer to the real situation. Very few things are proven, what we hold to be true is based on any number of assumptions, prejudices, desires, and habits, and in the end the heart is boss. Even if our belief seems like assent to us, it's likely to be commitment.

I think Hume said something along these lines. The reason is servant of the passions, and that's how it should be. Or maybe just how it must be.

I think belief is being made aware.

Perhaps that's why some don't have any.