I read a book a while ago.

It's called :

They Like Jesus but not the Church by: Dan Kimball

I loved it, I wish to re-read it, yet I do not own it. 

Other good reads that I do own if one is interested on the topic: 

Why bad Christians happen to good people: by Dave Burchett

and

Radical Refirmission: Reaching out without Selling Out: by Mark Driscoll