Studies can be found here:
http://www.scribd.com/doc/18373331/The-Chronic-Dependence-of-Popular-Religiosity-Upon-Dysfunctional-Psycho-Sociological-Conditions
"In general, higher rates of belief in and worship of a creator correlate with higher rates of homicide, juvenile and early adult mortality, STD infection rates, teen pregnancy, and abortion in the prosperous democracies "
http://moses.creighton.edu/JRS/2005/2005-11.html#figures