I ran across this video today in my daily internet perusal and I thought it would be of interest to you as well. In it Dr. Ed Stetzer describes what he calls “the rise of the ‘nones'” and explains why, at least from what he has been able to research and observe, “conversion” Christianity is actually on the rise, and what is in decline is the nominal Christianity of primarily mainline denominations. I think most importantly in the process he points out that many of these statistics, such as the one that says 94% of America’s youth leave the church after leaving high school, are not accurate, but can become dangerous self-fulfilling prophecy for those who give it too much credit.
Theology in Community 
I’ve seen a lot of this myself. Society is pointing a burning lens at Christianity and a lot is falling off, but I’ve noticed that it’s mostly dross that’s charring and peeling away, the “fluff” of people who never really had true commitment. What’s left from this burning is the Christians who are really in it for the long haul, and they’re only being tempered, not burned.