We can already see the benefits when countries move away from religion. Sam Harris wrote:
'Countries like Norway, Iceland, Australia, Canada, Sweden, Switzerland, Belgium, Japan, the Netherlands, Denmark and the United Kingdom are among the least religious societies on Earth. According to the United Nations' Human Development Report (2005) they are also the healthiest, as indicated by measures of life expectancy, adult literacy, per capita income, educational attainment, gender equality, homicide rate and infant mortality. Conversely, the 50 nations now ranked lowest in terms of human development are unwaveringly religious. Other analyses paint the same picture: The United States is unique among wealthy democracies in its level of religious literalism and opposition to evolutionary theory; it is also uniquely beleaguered by high rates of homicide, abortion, teen pregnancy, STD infection and infant mortality. The same comparison holds true within the United States itself: Southern and Midwestern states, characterized by the highest levels of religious superstition and hostility to evolutionary theory, are especially plagued by the above indicators of societal dysfunction, while the comparatively secular states of the Northeast conform to European norms.'