"Postmodern leavers reject Christianity because of its exclusive truth claims and moral absolutes. For them, Christian faith is just too narrow. "Recoilers" leave because they were hurt in the church. They suffered some form of abuse at the hands of someone they saw as a spiritual authority. God was guilty by association. "Modernists" completely reject supernatural claims. God is a delusion. Any truth beyond science is dismissed as superstition. "Neo-pagans" refers to those who left for earth-based religions such as Wicca. Not all actually cast spells or participate in pagan rituals, but they deny a transcendent God, and see earth as the locus of true spirituality. "Spiritual Rebels" flee the faith to indulge in behavior that conflicted with their faith. They also value autonomy and don't want anyone -- especially a superintending deity -- telling them what to do. "Drifters" do not suffer intellectual crises or consciously leave the faith; they simply drift away. Over time God becomes less and less important until one day he's no longer part of their lives."Some interesting categories there. Interview with Drew Dyck who has written "Generation Ex-Christian: Why Young Adults Are Leaving the Faith ... and How to Bring Them Back".
Birmingham News, October 23, 2010