I was raised Catholic. I started noticing some contradictions in my own faith. Then I investigated other religions and found out how bogus they all were. So I started searching the web for arguments for and against religion. At this point I was leaning towards Atheism already. Then I read The God Delusion by Richard Dawkins. Great book. That pretty much sealed the deal for me. Now I'm struggling to communicate to my family, friends, and girlfriend, my new lack of belief.
"I trust my own reason and my own capacities to think and educate myself and to reach greater levels of knowlege and status through learning and work. To me, wishing for a god is like wishing to be a slave, it is like declaring that one is too incompetent to handle one's own affairs." - the germans are coming