Pure agnosticism?

I've just realized that my beliefs had a name, agnosticism, and searching on the web I found the mainly branches of it, but I disagree with all them. I think they all assume things based on experiences or probabilities also based on experiences.

e.g.

weak vs strong agnosticism. how do you know it can or can not be proved? you're assuming it

atheist vs theist agnosticism. you are assuming something and then saying "but i dont know"

I'd define agnosticism as someone who neither affirms nor denies spirituality

I've read so many people saying that they're agnostic and then tells why using experiences instead of just logic (yeah, I'm assuming that logic leads to truth)