Midwest Politics show yesterday, host David Pakman pointed out that there is a correlation between religion and intelligence. The higher the IQ a person has, the less inclined he or she is to be deeply religious. How income affected this correlation was reported in 2008 in research publish by a retired Danish professor of psychology, Helmuth Nyborg.
As Pakman points out, there are a lot of factors that play into this, such as poverty, lack of education (which tends to be a product of poverty), and how people think (i.e., whether they are intuitive thinkers or critical thinkers). He also points out that if people are taught a certain way about religion and they do not have the resources or education to question those beliefs, they will remain religious. Religion serves as a "beacon of hope" for people struggling with poverty.
The correlation between IQ and religiosity is clear, Pakman observed, but the causation is not very clear.