A review of 63 scientific studies dating back to 1928 has concluded that religious people are less intelligent than non-believers.
Only 10 of the 63 studies showed a positive correlation between intelligence and religiosity.
The paper, entitled The Relation Between Intelligence and Religiosity: A Meta-Analysis and Some Proposed Explanations, was led by Professor Miron Zuckerman of the University of Rochester, and was published in the academic journal Personality and Social Psychology Review on 6 August. ...
... Zuckerman’s team studied decades worth of analysis, noting many atheism and intellect studies “share one central theme – the premise that religious beliefs are irrational, not anchored in science, not testable, and therefore unappealing to intelligent people who ‘know better’.”
...Religiosity is defined as involvement in some (or all) facets of religion, which includes belief in the supernatural, offering gifts to this supernatural, and performing rituals affirming their beliefs.