I am skeptical of agnosticism.

I think that either you believe there is something other than the natural world, a "higher" "power" or a god or God or gods or something, in which case you are what the French would call "croyant" - believing; or, you don't, in which case you're an atheist.

I don't think that you have to either believe, or profess, that there actually are no gods, to be an atheist. All you have to do is not believe in anything supernatural.