In a paper last month in the online journal Evolutionary Psychology, Gregory Paul finds that countries with the lowest rates of social dysfunction—based on 25 measures, including rates of homicide, abortion, teen pregnancy, sexually transmitted disease, unemployment, and poverty—have become the most secular. Those with the most dysfunction, such as Portugal and the U.S., are the most religious, as measured by self-professed belief, church attendance, habits of prayer, and the like.