Knowledge is a belief that just happens to be true, and if some imperative about whether it is to be clung to should arise, it is justified by strict rules of logic; else, it is justified by common sense rules.
The agnostic is the person who can honestly say that that restriction ("knowledge" as it is defined above) cannot apply for whatever reason.
We might agree on this.
However, I would love to see your classifications for the following sorts of beliefs.
There are no gods, of that I am sure.
I do not believe any gods exists.
I do believe that no gods exist.
I have no belief in a god or gods, because I have not seen any evidence of their existence.
I have no belief that any god exists, but then I have no belief that they do not exist. I need more evidence.
I cannot be certain, but I do not believe that a god exists.
I cannot be certain, but I do believe that a god exists.
I believe that a god or gods exist.
I do not believe that no god exists.
God exists, of that I am certain.
I don't know if any gods exist
I don't know if any gods exist...I need more evidence.
Feel free to add to this list if you feel I missed someone.