Anthony Sacramone gives a good answer to those studies–like this one–that show that poor states and countries are more religious than the rich and secular ones, implying a correlation between secularism and success. He also deals with studies about how socially virtuous the arch-secularist countries are. Yeah, if you consider abortion, promiscuity, and euthanasia as virtuous. From Strange Herring:
Poor people, sick people, desperate people will, by and large, be among the most religious for a very good reason: Those on the ragged edge have the most acute sense of the fragility of life, of their own contingency. Wealthy, educated folk have a much more profound sense of being “in control.” What do they need with a heavenly father or benign providential care or direction? They have an AMEX black card.