Having grown up in the church with hardcore christian parents this issue is close to me. I stopped going when I was 18 and have progressed to the point where I could never again believe in it.
For all those interested I think Nietzsche has some very interesting things to say about christianity, the psychological origins of it and things along those lines. The first couple essays in On The Geneology of Morals are fantastic, I'm actually surprised that Cheese has not posted some of Nietzsche's views, perhaps he is not familiar with them. A lot of his points hit home for me having grown up in the church.
I'm signed up to take a Humanities Critique of Religion class next semester and the focus will be on Christianity. The texts used will be Freud's Future of an Illusion, Feuerbach's Essence of Religion, the Marx-Engels reader and Nietzsche's Twilight of the Idols and Nietzsche's The Anti-christ. I'll be happy to let everyone know how it goes