Which Came First, Religion or Low Intelligence?

A meta-analysis shows what most people already know, that the more religious you are, on average, the less intelligent you are likely to be. Of course religious people are less intelligent in general. But the real question is why? Do they start off less intelligent and therefore are easier to be seduced by superstitious nonsense, or is an initial belief in superstition that they were indoctrinated into during childhood hindering the development of critical thinking skills, thus making them seem less intelligent? Or maybe some combination?

Take the poll.