Atheism (and theism) are statements of belief. Agnosticism is a statement of fact. Not schizophrenic.
Atheism -- belief that there is no such thing as a God/the supernatural
Theism -- belief that there is such thing as a God/the supernatural
Agnosticism -- statement that the individual has no clue whether or not there is such thing as a God/the supernatural
Nor is it irreconcilable to be agnostic and atheist/theist. Simply claiming one doesn't know the answer to the theist/atheist question is insufficient; agnosticism is choosing not to choose a side, which works as a pure statement of belief but doesn't work when one has a choice between atheist or theist action. (For a broad example, say one is commanded to go to church once a week as part of one's faith. You cannot abstain from that decision, because "going to church" and "not going to church" constitute all the actions one can take on that day of the week. One cannot neither go to church nor not go to church, if that makes sense; you have to choose between going or not going, whereas an 'agnostic' would, on virtue of not deciding between the two sides of the question, not decide whether or not to go.)
As the band Rush puts it in their song "Freewill": "If you choose not to decide / You still have made a choice." You can't choose not to decide when you have to act on something.
So in terms of pure, isolated statements of belief, I am an agnostic; I am willing to acknowledge I don't ultimately know. But for all intents and purposes I'm an atheist.
And furthermore I'm not too concerned about the agnostic label, even. I'm as agnostic about a God as I am about fairies. Sure, they might be there, invisible, not emitting a heat signature, granting those little wishes I absentmindedly find myself thinking and surprised to see come true; but I sure as hell don't believe there are fairies there. Replace fairies with God and the statement holds, at least for me.