Ranting and Raving

Not quite. There is a difference between what you know and what you believe. I believe my car's still parked outside, but I haven't looked since yesterday. To acknowledge that you don't certainly know is but half of it, and you can do this while still believing there is a God (thus being theist) or believing there is no God (thus being atheist). To be truly agnostic is to see no reason to believe either at all, because the lack of evidence is so complete that you don't know and can't even really guess.