... when what I usually see is theists saying "I know (there is God, God created the universe, etc)" and atheists saying "I don't know (if there is God, what before the Big Bang, etc)".
Yeah, I know what you mean. I just got done answering a question about this. It's an unfair accusation. I mean, which group is it that says they have a single book that has ALL the answers of life in it? It's not atheists...