Why do we need religion?

My blogging friend over at Apprentice2Jesus has drawn attention to a terrific article, The Moral Animal by Jonathan Sacks in the New York Times Opinion Pages, where Darwin and Religion are discussed.
"Still in Britain three in four people, and in America four in five, declare allegiance to a religious faith. That, in an age of science, ... is truly surprising," he writes. "It remains the most powerful community builder the world has known. Religion binds individuals into groups through habits of altruism, creating relationships of trust strong enough to defeat destructive emotions. Far from refuting religion, the Neo-Darwinists have helped us understand why it matters."...and so on...
The fact is that religion is Social Capital WRIT LARGE. And as Sacks concludes, "Religion is the best antidote to the individualism of the consumer age. The idea that society can do without it flies in the face of history and, now, evolutionary biology."