Before John Lennon imagined "living life in peace," he conjured "no heaven … / no hell below us …/ and no religion too."
No religion: What was Lennon summoning? For starters, a world without "divine" messengers, like Osama bin Laden, sparking violence. A world where mistakes, like the avoidable loss of life in Hurricane Katrina, would be rectified rather than chalked up to "God's will." Where politicians no longer compete to prove who believes more strongly in the irrational and untenable. Where critical thinking is an ideal. In short, a world that makes sense.
In recent years scientists specializing in the mind have begun to unravel religion's "DNA." They have produced robust theories, backed by empirical evidence (including "imaging" studies of the brain at work), that support the conclusion that it was humans who created God, not the other way around. And the better we understand the science, the closer we can come to "no heaven … no hell … and no religion too."
Like our physiological DNA, the psychological mechanisms behind faith evolved over the eons through natural selection. They helped our ancestors work effectively in small groups and survive and reproduce, traits developed long before recorded history, from foundations deep in our mammalian, primate and African hunter-gatherer past.