Tyler VanderWeele's group at Harvard just published http://archinte.jamanetwork.com/article.aspx?articleid=2521827 a comprehensive study indicating longevity is correlated with spirituality.
I know Vanderweele because he is an outspoken Christian, but he is also one of the leading epidemiologist in the world.
It's an interesting study and adds credence to the idea that religion gives a Darwinian survival advantage; more importantly than this data, it is well documented that Theists have more children than Atheists.
