Nicholas Wade reports in the New York Times:
In the Oaxaca Valley of Mexico, the archaeologists Joyce Marcus and Kent Flannery have gained a remarkable insight into the origin of religion.
During 15 years of excavation they have uncovered not some monumental temple but evidence of a critical transition in religious behavior. The record begins with a simple dancing floor, the arena for the communal religious dances held by hunter-gatherers in about 7,000 B.C. It moves to the ancestor-cult shrines that appeared after the beginning of corn-based agriculture around 1,500 B.C., and ends in A.D. 30 with the sophisticated, astronomically oriented temples of an early archaic state.
This and other research is pointing to a new perspective on religion, one that seeks to explain why religious behavior has occurred in societies at every stage of development and in every region of the world. Religion has the hallmarks of an evolved behavior, meaning that it exists because it was favored by natural selection.