God once walked in the Garden of Eden in the cool of the evening, but no more. Ever since, the deity has left invisible footprints—until now, perhaps. Brain research has gotten sophisticated enough to peer into the working of minute areas of the brain, and neuroscience makes maps of regions that used to be terra incognita. Such maps can tell you which areas of the cortex light up when a person feels compassion, possesses strong faith, has a holy vision, hears voices, or prays. “You are the light of the world,” which Jesus said to his disciples, suddenly has a literal meaning. In fact, the
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