What's silly is having a word for somebody that doesn't believe in something in the first place. See: "nongolfers"
There are a bunch of similiar terms I see used often.
But take 'nongolfer's and split it into a few more groups; that's what I'm talking about.
You have group A, who sees atheism as meaning one thing, and identifies as that.
You have group B (this is some of people who identify as agnostic), who sees atheism as meaning something else, and calls themself something different, which they define the same way that group A defines atheism.
Etc.