UnChristian, by David Kinnaman and Gabe Lyons, I thought had a lot of insight into the problem. Most churches are resisting the conclusions the book reached, however.
In the information age, traditional churches supplying pat answers just doesn't resonate. Young people will no longer accept authority without reason, and that's what too many churches provide.
and yeah, participating in Kingdom work, well, works a lot better than sitting with funnels in their heads, receiving information.