The rate of growth of religion: unaffiliated is decreasing.
I don't know what to make of that. In my opinion the church is healthier than ever. At the university and at my church I run into younger versions of myself all the time: committed Christians who did not grow up in Christian homes. (And they often are Calvinists!)
I have never been concerned about an overall drop in numbers. First of all I didn't see it. Even more importantly, nobody has (or perhaps even can) estimate what percentage of those leaving the church were merely cultural Christians who identified as Christian because of family, peer, or societal pressure. Now that the stigma of being an unbeliever is diminished, they are leaving the church--and that is a good thing. It's a win-win. In this model the atheist movement, such as it is, is not deconverting Christians, it's freeing people to be honest about their lack of belief.
How accurate or important is that mechanism? Nobody knows.