Hummm.
The whole history would involve the 1950's when debating atheists decided to "evolve" the word to mean "without a belief in God." That would certainly increase their ranks, since they started claiming that EVERYONE is born as an atheist...and then is indoctrinated into a religion. The asserted that all babies, toddlers, and people with defective thinking (who could not form a belief in a god) were, BY DEFINITION, atheists.
I think that was underhanded. I have no belief in any gods...but there is no way I would use the word "atheist" as a descriptor. NOTHING WRONG WITH BEING AN ATHEIST. Nothing at all. It is as moral and intelligent as being what we now refer to as a "believer."
But I am not an atheist.
Since that causes lots of problems in discussions, I have stopped using the descriptor agnostic...and simply described my take on the situation as clearly as I could.
I have asked others who call themselves atheist to describe their positions with the same rigor I described mine. So far...none have taken me up on that. I am not sure why.
How about you...IF YOU USE atheists as a descriptor or as part of a descriptor?