What are the central beliefs of Islam, and how are they reflected in the "Five Pillars”
I couldn't get into the www.islam.com website at the moment, but you might want to check back there eventually.
Meanwhile, peruse this: http://en.wikipedia.org/wiki/Islam -- and don't forget to scroll down a bit and read Five Pillars (section 3.1) in the table of contents.
=)
http://atheism.about.com/od/islammuslims/p/Beliefs.htm