I'd like to join the club, and jump right into the debate.
But first a little something about my background.
My parents did not baptise me, thinking and later telling me I should make my decision about god later in life, something I recommend more parents should do. They never told me anything about god or jesus, apart from the Christmas story which I never really associated with Christianity as a kid, somehow. The only religious "teachings" I had really were the ones I got at school, there were a couple of those, such as Sodom and Gomorrha (spelling?), Noah's Ark, the Easter story, Adam and Eve, genesis and of course also the Christmas story (again). But these stories I saw more as exciting stories. I never thought of it as religious.
Now I write it down I realize that the 1st and 2nd year of my school time actually included quite a bit of religious "education". But as I've said it never had a great impact on me. I think my older brother had a big impact on my atheist thoughts and, in general, people I looked up to as intelligent, sensible people seemed to fly the atheist flag. The more I learned about religion and it's history the more I doubted it. Pretty much my whole (close) family is now atheist or only very loosely tied to religion. To me religion is fantasy until proven right, to me it's the same thing as if someone would say "hey there's an orc in the garden." and not show me the orc.
Anyway, to the debate.
I agree that even milldly religious people are partly responsible for extremists. If you tell someone the bible or the koran or the torah is the word of god, then it is only normal that some people will take those books literally with all their atrocious sayings such as (the bible) "homosexuals should be stoned". I understand that normal non extremists use these books for good. But I think there are better inspirations that don't include the evil stuff that the religious books have in them.
To put my views quite simply: religion has negative side effects. A moral upbringing hasn't.
I think an important point to make to all mildly religious people (in this case christian) is, you don't believe everything that's said in the bible. Do you really think people who work on the sabbath should be killed and all homosexuals should be stoned? And when you realize that you don't believe these things, you realize that you never really used the bible to make moral choices in the first place. The problem is: extremists often do.
To give you something else here's an interesting video about anti-atheism and some of the negative impacts of religion: http://www.youtube.com/watch?v=CMpWRZ7_A 34