"Average intelligence predicts atheism rates across 137 nations". Elsevier Inc. doi:10.1016/j.intell.2008.03.004."using data from a U.S. study of 6,825 adolescents, the authors found that atheists scored 6 g-IQ points higher than those adhering to a religion.""Among the sample of 137 countries, only 23 (17%) had more than 20% of atheists, which constituted “virtually all the higher IQ countries.”"
http://en.wikipedia.org/wiki/Religiosity_and_intelligence
http://www.telegraph.co.uk/news/uknews/2111174/Intelligent-people-less-likely-to-believe-in-God.html
