Like many contemporary issues, moral discourse finds itself in the middle of a great divide. On one side of the chasm sits much of contemporary Western philosophy, moral psychology and the social sciences, which often view morality as a purely natural phenomenon. This view argues that human morality can be fully explained by appealing to naturalistic processes such as kin selection, reciprocal altruism, cultural evolution, and various models of social contract theory. In this context, God's e...