In a worldwide study of the at Ross University Medical School it is concluded that religious belief declines sharply with rising education and, especially, intelligence. And Wikipedia says: “According to a 2015 global survey by Gallup International, the most religious had lower levels of education…”
So it is fair to say that when you talk to some real believer he/she is probably quite little educated and pretty stupid.
But the questions that does not leave me is why do these believers get so much attention when they are preaching i.e. trying to explain to the obviously more educated how the world works?