>>36, YOU FAIL IT!
Theism is a belief in a god or gods. Atheism (negating prefix "a-" + "theism") is a lack of any such belief.
Given that I have never heard a definition for "god" that was not either trivially provable to be nonexistent, a logical paradox, or a meaningless noise, atheism does not require faith at all.
>>36 does not know the difference between strong atheism and weak atheism.
http://atheism.about.com/od/atheismquestions/a/strong_weak.htm
http://en.wikipedia.org/wiki/Atheism
http://www.religioustolerance.org/atheist.htm
http://www.objectivethought.com/atheism/strongatheism.html
PROTIP: when you are talking about what atheists believe, maybe you should ask an actual atheist.
So, to recap, theism is the belief that one or more gods exist, and atheism is the position that theists have not proven this claim.
p.s. 37GET