I may have had a prejudice against agnosticism as a body of thought: sort of a fence-sitting theory, where you can't make up your mind one way or another.
You go back to T. H. Huxley, who coined the term, what he said - and I came to believe he is right - is that agnosticism asserts not only that he himself didn't know if there was a God or not, but that nobody could know.