Carlo Strenger in The Guardian:
For some reasons it seems to be anathema to say that there might be an intrinsic reason for the correlation between educational level and the rejection of religion: atheism takes training, and is more difficult. We accept that in medicine, physics and mathematics, but, for reasons of political correctness, it is very much considered a faux pas to say the old 19th-century thing: it takes education to develop a worldview based on science. It would be even more outrageous to say that the reasons for choosing atheism over religion might actually be valid, as the so-called new atheists have dared to claim. It seems that it has become something of a class-thing (not necessarily socio-economic, but of belonging to the politically-correct elite) to bash Dawkins, Dennett and Hitchens.
Let's look at some facts and arguments, then. According to the Pew survey, 85% of humanity is religious in some way, and that's probably a low estimate, since nobody knows the true figures about China. This doesn't mean that religion is true (it can't, because religions contradict each other), but that there are strong cognitive and motivational factors that give religions an evolutionary advantage in the market of ideas. A scientific worldview is cognitively and emotionally more difficult, and hence at a disadvantage.
More here. [Thanks to Nikolai Nikola.]