ascot, an excellent site for explaining evolution to the layman is:
http://www.talkorigins.org/
Hell, that's the site I first went to.
This is a general overview of evolution, but there is much more in the archives to read besides it, of course:
http://www.talkorigins.org/faqs/faq-intro-to-biology.html
My path to non-belief was gradual; from strong JW, to liberal JW, to liberal christain "who does not believe in religion, only the bible", to deist, to agnostic, and now to weak atheist (or as I call it "agnostic atheist". But I am a darn strong atheist when it comes to biblegod). Most of the stuff other posters have said also applies to me; as I educated myself more about other religions, past cultures, about science, and about the bible itself (its pagan connections, unscientific claims, etc.), I began to realize just how human and non supernatural the whole "religion thing" is. When people could not explain something, they posited "god" as the answer, but god disappeared as soon as someone who challenged the dogma showed how natural processes explained a phenomena. If rulers wanted to keep "the people" in check, there was(/is) no better way to do this than to threaten them with the wrath of god.
Of course, having doubts about the JW's is what started the ball rolling. Once I knew that the JW's were wrong, I began to allow the questions that I always had at the back of my mind about god to come to the surface. If I could be analytical about the JW's, why not the bible? I realized the answers I had been taught were unsatisfactory, and that the answers that mainstream Christanity had were equally as bad. I read apologetic books like the popular Josh McDowell book(The Evidence that Demands a Verdict), and the Lee Stroubel (TheCase for Faith) book as well, but I knew I was in trouble when I was able to so easily refute many of the arguments they presented with little difficulty and nary any research. Thus I stopped believing in the bible's god. My journey from deist to where I am now was alot less defined. As I started to parse out my philosophy more, I just sort of realized I didn't really believe anything anymore. Even after I stopped believing the bible, I would still occasionally pray to some non descript entity, but then one night I as I was about to do this, I asked myself "why am I doing this? I don't really think anyone is hearing me." And then the epithany of non belief totally hit me. So, here am today .