You may be right by this definition....
An
agnostic is one who believes
it impossible to know anything about God or about the creation of the universe and refrains from commitment to any religious doctrine. An atheist is one who denies the existence of a deity or of divine beings
So, I may not have ever been agnostic, because, I'm not sure I ever thought it was IMPOSSIBLE to know....
Even as a Christian, I believe there are things about God IMPOSSIBLE to know.......... maybe I'm a Christian Agnostic? LOL!