Is atheism a belief?

[Angrboda]

This is the only claim I have been making: those atheists who have heard and rejected religious claims have reasons why they reject them. And that these reasons are the things that they believe. 

Well, first I'll note that you've moved the goalposts. First it was all adult atheists (because presumably child atheists can't grow into adults without having heard and rejected religious claims for evidentiary reasons, for some unknown reason; and we all know that children aren't real people or real atheists anyway). Now it's "all atheists who have rejected religious claims." Well, now you've moved the goalposts far enough that what you've stated is a tautology, necessarily, "all atheists who have rejected religious claims" are a) atheists, and b) people who have a belief that religious claims are worthy of rejection (though even 'b' doesn't follow necessarily). I'm highly unimpressed. As pointed out, there are and have been many atheists who don't fit that category, and, even if there are some that do, that isn't a necessary part of their atheism, which is what you originally claimed.

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they were skeptics who embraced a different metaphysics and philosophical outlook.

Right. The different metaphysics and philosophical outlook to which they were committed made them doubt the claims of the people who said there were gods. 

In other words, when presented with the claims of religious people, the skeptics rejected those claims based on prior intellectual commitments (i.e. beliefs).

Which had nothing to do with believing that the evidence of religions other than their own was insufficient, which was your original claim. Do you not read your own shit, or are you just terminally stupid?

I'll repaste your prior statement because apparently you don't read the shit that you yourself write.

~ 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."