Can you prove to me that you're an agnostic? In actuality, agnosticism is all we can hope to amount to, because nothing is provable. Facts do not prove or disprove anything. They just lead us to believe certain things are true or untrue. In the case of adding 2 plus 2 and getting 4, you can assume that everytime you add 2 and 2, you will always get 4. You cannot truly know this unless you were adding 2 and 2 together for eternity (which by defenition doesn't end, so you wouldn't ever know).
Despite the fact that it can never be proven, it is safe to act on the assumption that 2 plus 2 will yield 4. I cannot prove this, but it hasn't failed me yet. For me, atheism is the same way. I cannot prove that no god exists, but I act as if none does, because my experiences have lead me to believe this.
My point is, agnosticism is correct, but is just utterly worthless. While I am an agnostic, I prefer the stances atheism offers. I may not be 100% sure the Christian god does not exist, but at 99.99%, I'd feel safe denying him. I don't make the mistake of saying I'm 100% sure of something, because I know that it's impossible to be sure of anything. On the other hand, my actions will reflect what I cannot believe.
On the other hand, there are people who hold beliefs without any solid evidence and will state them as fact. Although theists are more often than not guilty of this, an atheist will sometimes be guilty as well. Whats worse is when they do this when solid evidence is presented to the contrary. Blind faith is shakey enough, but defiant faith is dangerous. Which brings me to my little table saying what I believe to be acceptable:
Good faith: Belief in something with strong evidence to support it. Ex: 2+2=4
Acceptable Faith: Belief in something with some evidence to support it and little to refute. Ex: I think this post will get a response.
Blind Faith: Belief in something with little or no evidence to support it, but little or none to refute it. Ex: I believe there's a teacup in orbit around Mars.
Defiant Faith: Belief in something with little or no evidence to support it, but strong evidence against it. Ex: The earth is flat.
We have words to accurately describe these, and they are: knowledge, beliefs, hunches, and stupidity respectively. My belief that there is no hell is good at best, and acceptable at worse.
Can you prove you're reading at your computer right now? Can you prove that the world we live in isn't just a simulation of the mind controlled by machines in a parallel world?
Well I didn't want to get off on a tangent about absolute truth. Now that is abstract philosophy.
But yeah, I would categorize Atheism under Blind Faith just as I would Theism, because I don't see why it would be safe to act on the assumption that God doesn't exist. If he does, then you're supposedly going to hell for denying him.
And I don't see why agnosticism is utterly worthless; it satisfies both ends. I haven't denied him, but I haven't accepted him. Unless I'm quite mistaken, only denial is the mortal sin. We won't ever know until we die, or until God gives us one hell of a sign (oh the irony of that sentence ).
Edit: And btw, if you're not 100% sure that God or any deity doesn't exist, then you're not an Atheist.