I'm not trying to start a huge argument about this, because like I said, these are just words.
But you're confused about what agnosticism means. It doesn't mean "I don't know".
To put it another way, atheists and theists (which includes all monotheistic religions) agree on something. They agree that the answer to whether or not God exists can be found by observing, studying, and critically analyzing the universe around us. They believe that the existence of God, or the non-existence of God is something that we can investigate and come to an educated conclusion. So atheists and theists agree that there is evidence in the universe that can allow them to make an educated assumption. They just disagree on the conclusion; the atheist says that evidence points to there being no God, and the theist says that evidence points to there absolutely being a God, one who has revealed himself.
Now, way out on the other end of the playing field, is agnosticism, and it's TOTALLY different. The agnostic says that there is no way that you could ever make an educated assumption about the existence of a God, because any such question is so far and above the ability of human understanding that the question is almost not worth asking.
Now, there's plenty of room for atheists and theists to have doubts about their positions. A lot of atheists will say that they don't believe in God, there's no evidence for a God, the belief in God is non-cognitive, etc., but there's no way to know for sure. And theists, Christians and the like, talk about doubt quite a bit.
But having a belief one way that is infused with doubt does NOT make you an agnostic.
Judge a tree by it’s fruit.
An atheist is dangerous to his fellow man, because of his spiritual viewpoint. He is his own god. And that makes him seriously dangerous to mankind. Think Pol Pot or Stalin.
An agnostic just isn’t sure. A Christian is, and an atheist is. If you’re not sure, then you are an agnostic.
Regarding Christians having doubt, it is the specifics of our belief in which we have doubt. e.g. I’m a mid-tribulationist, but I acknowledge that I may be interpreting prophesy wrong. That puts me in very good company, however, because even the apostle Paul, religious scholar though he was, didn’t “see the lignt”, literally until confronted by Jesus himself.
There are very few atheists.