This is my understanding.
If you believe there are gods or a God, you are a theist.
If you believe there is no God or gods, you are an atheist.
Everyone else, who is neither certain there is a God or gods, nor certain that there isn't or aren't, is agnostic.
An agnostic has not ruled either possibility out.
The Christian who starts to doubt is an agnostic.
The person (likely calling themself sn atheist) who is pretty sure there is no God/gods but states they would change their mind with proof, is an agnostic!
All of you who did not choose 100% or zero on the belief question, are agnostics.
As for myself, I don't care. Not having an opinion and not even thinking about it, makes me agnostic.
There may be more useful ways to blend these categories for various reasons. For instance, the agnostic who is just a questioning Christian has a lot more in common with the theist, than with the almost atheist agnostic who claims they would believe with proof. That agnostic has 99% in common with an actual atheist. But I think it is important to remember or understand that most people here are agnostic. And I also want to say it is not useful to claim someone isn't an agnostic because they lean theist.
Thoughts?