Belief and Knowledge

[Esquilax]

To what extent then does the category of atheism overlap naturalism? Seems to be at least 90% on AF at least.

For starters, even if it was 100% on AF, we comprise a relatively small set of all atheists, meaning your problem is still with philosophical naturalism and not atheism. Secondly, I'm not exactly going to take what it "seems to be" to you more seriously than I will the statements of the actual people involved; you have a habit of trying to tell other people what their atheism is, after all.

Lastly, we need to acknowledge the distinction between philosophical and methodological naturalism, of which I'd think the majority of us affirm the latter, rather than the former. Methodological naturalism is not a worldview either, merely a pragmatic concession with regards to what we can detect and test.