Is atheism a belief?

[Belacqua]

All adult atheists, who have heard and rejected religious claims, have one belief in common. 

They believe that the claims of religion are unpersuasive.

My word but you are wrong a lot. 

I am sure that I am wrong a lot!

Please help me to understand why you think I'm wrong.

 Atheism is a belief in the same way that not collecting stamps is a hobby or bald is a hair colour.

Let me clarify what I'm saying here, and then I hope you'll tell me which of my statements is incorrect.

~ All adult atheists have heard claims made by religious people. For example: "God made the world." 

~ All of us reject these claims. We do not find them persuasive.

~ We reject these claims because we have solid convictions about what constitutes good evidence. For example, "scientific evidence is better than revelation, and there is no scientific evidence that God made the world." 

~ Therefore, all adult atheists have commitments concerning the way we evaluate truth claims, and these commitments lead us to reject the claims made by religious people. 

~ If we didn't have commitments concerning the way we evaluate truth claims, it would mean that we reject religious claims based on no reasons, but merely on a whim or by personal preference. 

If any of this is wrong, please explain why. Thanks.