Why do kids walk away from faith?

How can someone raised in a faithful Christian home and positive church environment fall away from faith? Is there some sort of generational dynamic at work? Are Christian parents and others doing something wrong? Can something be done to prevent our kids and younger friends from walking away? In this followup to the video Do Christians Drive People Away?  Dr. Michael Bogart explains the tendency of generational cooling off and give some solutions to prevent or reverse the dynamic.