Is atheism a belief?

[Belacqua]

I believe in no gods because there is no evidence for any gods.

This statement shows that we are actually in agreement.

My claim all along has been that adult atheists who live in a society have all

1) heard the claims of religious people,
2) evaluated those claims based on certain criteria, and 
3) rejected those claims. 

The failure of the claim to meet the criteria is the reason that atheists reject the claim.

So I think it's certain that you have 

1) heard the claims of religious people (e.g. "There is a god.") 
2) evaluated that claim based on a particular criterion (in your case, "is there evidence for this claim?")
3) rejected the claim based on the fact that there is not good evidence.

The fact that there is no evidence is the reason you are an atheist today. 

That is what I have been claiming.