Mark Chaves, a professor at Duke, studies American churches. He recently wrote about Evangelical vs. Mainline churches in their ability to keep young people in the church, and he found that Evangelicals do a better job, in part due their investing more money and effort into youth ministry.
He also summarized work by James Wellman on different expectations of the church. "For evangelicals, if children and youth are not enjoying church, it is the church's fault and evangelical parents either find a new church or try to improve their youth ministry," Wellman said. "For liberals, the tendency is the reverse; if youth do not find church interesting it is their problem. Evangelicals are simply more interested and invested in reproducing the faith in their children and youth and their churches reflect this priority."