Here are some quotes from David Kinnaman's book You Lost Me: Why Young Christians are Leaving the Church.
1. Teenagers are some of the most religiously active Americans.
2. American twentysomethings are the least religiously active.
The ages 18-29 are the black hole of church attendance.
A generation of young Christians believes that the churches in which they were raised are not safe and hospitable places to express doubts. Many feel that they have been offered slick or half-baked answers to their thorny, honest questions, and they are rejecting "talking heads" and "talking points" they see among the older generations.