I'm no expert on the definitions of atheism or agnosticism, but I believe Matt Dillahunty (who is an avowed atheist) might disagree with you. He uses logic to quite a high degree to assert his position. I believe he's even said if you're agnostic you really are an atheist, because the word a(without) theism(a belief in God) fits the agnostic. He also says no one can truly be agnostic...you either believe or you don't...which I really don't agree with.