Q said:
"I'm going to try to reword it again. (For "god" also read "gods".)
1) Belief: I specifically believe there is no god.
2) Non-belief: I don't absolutely believe there is a god.
Anti-belief: Okay, I realized that non-belief and anti-belief are close to the same thing, once I tried to put it into other words! It's sort of "I don't believe in belief about god"."
But if someone says 2 it inherently implies 3:
3) I don't absolutely believe there isn't a God.
Which would necessarily make them an agnostic who doesn't absolutely believe in either the existence or non-existence of god/s.
If someone claims 2 but denies 3, they actually invalidate 2 also, they contradict themselves, because 2 inherently implies uncertainty:
"I don't absolutely believe there is a god"
Yet if they can't also say that they "don't absolutely believe there isn't a God" then they reveal that actually they DO absolutely believe there isn't a God, which belies their previous claim of uncertainty (2).
Selective claimed "non-belief" is belief, otherwise non-belief would be applied consistently, unbiasedly, equally to all unproven claims both negative and positive ("there is" and "there is not").