What sysk is saying that atheism is not the belief that no god exists, but rather the lack of a belief in a god.

It's also not as if any two unsubstantiated and unprovable positions are just as likely to be true; see Russell's teapot[1].

[1]: https://en.wikipedia.org/wiki/Russell%27s_teapot

Ok, then we're using two different definitions. I use agnostic for the one you describe as "atheist".

Agnosticism is the stance that what we are talking about is unknowable, as opposed to gnosticism.

I think what you refer to as atheism seems closer to antitheism than anything else. The difference here is the same as the difference between "asocial" and "antisocial".

So is there any difference between agnosticism and atheism (as you use it)?

Yes, but they're not different points on a scale that goes from religious to irreligious, if that is what you mean.

One can be an agnostic christian, for instance, in which case one would believe that it is unknown or unknowable whether the divine or supernatural exists (and believe in it still).

What I'm relating to the difference between "asocial" and "antisocial" is the difference between "atheist" and "antitheist".

Yes, that's what I meant.

Depends on your precise definition. Most atheists consider atheism the lack of belief in a god, as opposed to the belief that there is no god. The distinction is important.

Most people I know who claim to be atheists seem to believe there is not god, despite not being able to prove it. Agnostics seem to be the most honest ones....

That's a very theistic way to frame atheism. Theism requires active belief in prescribed dogma, whereas atheism can include both rejection of said dogma or simply not subscribing to religious ideas.

For example, many people are vegetarian for one subjective reason or another. Just because I'm not vegetarian doesn't mean I believe being vegetarian is wrong or isn't a thing -- it just means I like eating meat and don't have the same reasons as vegetarians to subscribe to vegetarianism. And I don't think about vegetarianism, like how some atheists don't think about god; this stands in contrast with those who subscribe to religion, which requires active belief / prayer / practice / absorption of certain ideals into your identity.

That's interesting. I know plenty of people who label themselves as atheists, but AFAICT not a single one of them take the position of "belief in god not existing".

Atheism doesn't have any doctrines or the spiritual connection of a religion.

I didn't say it does. But it requires faith, i.e. belief into something that is fundamentally unprovable.

Still depending on definitions, but faith is the belief in something. Not accepting that there's anything to have belief in is something separate, and grouping a-theism with different types of theism isn't a usually accepted argument. I appreciate the angle you're taking, but the semantics of it are important.

Many of them believe in a big bang, that came from nothing where the laws of physics don't apply, and created the universe...... (Sounds almost as crazy as religion to me).

"Many" perhaps, but Atheism != scientific belief.