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For the bulk of our evolutionary history, human groups were small, tightly knit communities. Only quite recently, some human groups started evolving into the large-scale societies with vast interconnected trade networks we know today. Urban areas in Mesopotamia, for example, developed around 5,000 years ago. Whether trading or purchasing goods online, many people all over the world now interact with multitudes of anonymous people on a regular basis. How did this dramatic growth happen?
Surely, many factors played a role. Agriculture, for instance, provided resources that could sustain greater numbers of people. However, over the past few years, evidence has been accumulating that religious beliefs and practices may have stimulated our willingness and ability to engage in fair, cooperative behavior with many random, anonymous people. This level of cooperation can be used to create larger social networks and societies; but it can also bring people together to engage in collective violence and conflict.
religionnews.com/2016/02/21/christianity-islam-gods/Our team of anthropologists and psychologists decided to experimentally investigate how beliefs in gods – specifically those who care about how we treat each other and punish us for immoral behavior – may have contributed to more widespread cooperation. We tested this prediction in eight different societies from around the world to see if religious beliefs might have contributed to expanding humankind’s social horizons.