http://en.wikipedia.org/wiki/Religiosity_and_intelligence
The topic of religiosity and intelligence is the statistical relationship between intelligence and religiosity. Studies have begun to explore the link between religiosity and issues related to intelligence and educational level.
Various studies further suggest that
intuitive thinking and inductive reasoning styles tend to increase religious beliefs, but also imply more conservative beliefs in general. Less religious people prefer
analytical and deductive reasoning.
Highly religious countries (Barber, 2012 psychology today.):
Are poorer.
They are less urbanized.
Have lower levels of education.
They have less exposure to electronic media that increase intelligence (Barber, 2006).
Experience a heavier load of infectious diseases that impair brain function.
Suffer more from low birth weights.
Have worse child nutrition.
Do a poor job of controlling environmental pollutants such as lead that reduce IQ.
just some numbers for people with basic sense of logic to ponder upon.