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Um, atheism is the belief that no god exists.

You are probably "agnostic" which means you don't know whether God/gods exist but you are open to the idea. An agnostic doesn't worship anything or belong to a religion, but they don't think that God/gods are 100% fake... they are happy being fence sitters and not knowing because there's not enough satisfying evidence either way. emo

This has somehow gotten to be the popular definition of agnosticism. It has some problems with it. How can you assume, that as long as there is no evidence for something not existing, that the chances are 50-50?! Then there would be a 50-50 chance of existence for almost anything you can think of! The problem here is, where the burden of proof lies - it lies on the claimer. You have to demonstrate the existence of something, not the non-existence of it. Further more, most atheists ( who are atheist for good reasons, we'll leave out the teenage rebel atheist ) are not closed to the idea of god - in the case of sufficient evidence being provided, I'll happily believe it - but for now, there hasn't been any.

Again:

Agnostic - KNOWLEDGE
Atheist - BELIEF

I don't KNOW if god exists but I don't BELIEVE he does -> agnostic atheist.

Is that so hard to get, people?

Most atheists don't claim that god does not exit. They say they don't believe he does. Because we haven't seen sufficient evidence to believe the claim that god exists. For all practical purposes, I could say god doesn't exist - but that doesn't mean I know that.
Now, that doesn't make the position that god does exist an equally valid position (unless you have good reasons to believe, i.e. evidence). That is because if you accept something as true based on faith, you're accepting it without evidence - we're not accepting it without evidence. Which is, and I hope you agree, a more rational position to take.

I don't ask for proof, I ask for evidence.

Here's a simple way of putting things:

A theist believes in the existence of a god or gods and claims they exist. Often times theists belong to a relgion, but not always. Someone who simply says that they believe in god (even if they are not religious) fits into this category.

An atheist does not believe in the existence of a god or gods and claims they do not exist.

An agnostic does not claim knowledge of whether or not a god or gods exist, though generally they believe that there is a high likelyhood of a god or gods existing, or not. Some go back and forth between the two and many eventually become theists or atheists and sometimes vice versa. It sometimes is done out of indecision, but not always.

- An agnostic theist does not claim to know whether a god(s) does or does not exist, but believes they likely do. (Many times a nonreligious theist and an agnostic theist are confused about what they are and claim to have a certain religion [e.g. in America often they say they are a Christian] because of their confusion and/or lack of knowlege).

- An agnostic atheist does not claim to know whether a god(s) does or does not exist, but believes they likely don't. (Many times an atheist and an agnostic atheist are confused about what they are or think being one is "better" than the other. [For example, some of the stupid atheists say they are agnostic because it's "better" and some of the stupid agnostic atheists say they are atheists because it's "cooler"]).

I am an agnostic atheist. I do not know whether or not a god or gods exist, but I doubt they do.

It's very possible to not be religious yet not be an atheist. It's called being a nonrelgious theist, an agnostic theist, or an agnostic atheist.