It's probably a matter of semantics, but in my experience and usage, "theism" is belief in a deity/deities. "a- theism" is lack of belief in such, much in the way asexual reproduction is reproduction without the use of sex rather than "at odds with" the use of sex.
Gnosticism and agnosticism refer to knowledge or lack thereof. If I cared to use labels, I'd classify myself as an agnostic atheist. I don't claim the certainty of knowledge that there couldn't be deities, but I don't personally believe there are any (at least not in the sense of ultra-powerful entities that have/had some sort of interaction with the doings of humanity).
But isn't that more agnosticism that atheism?
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