Guys, agnostic doesn't mean what many of you think it means. I would go as far as to say that most theists and atheists are agnostic. It only means that you lack absolute certainty about a claim. Agnosticism is NOT a middle ground between atheism and theism.
Here's the bottom line.
Do you believe God(s) exist? If your answer is anything other than yes, congratulations...you're an atheist.
To those that thumbed me down, listen up. Atheism and Theism deals with what you BELIEVE. Agnosticism deals with what you KNOW, Therefore; if you lack a belief in God(s), you're an atheist pure and simple. It doesn't matter if you claim not to know whether or not God(s) exists because that's not the question. The question is do you BELIEVE God(s) exist. If you don't say yes, that means you presently LACK a belief in God(s) which makes you're an atheist. It's quite simple really.