Here are a few articles on how peace and prosperity are enhanced by secularism.
http://www.csmonitor.com/USA/USA-Update/2015/0316/Do-countries-become-less-religious-as-they-get-richer

http://pleiotropy.fieldofscience.com/2010/07/

Its a simple fact. Its actually a no-brainer!! If you want to banish a nation to poverty, sell them religion! That is precisely what the west have done to Iran!!