Religious people are less intelligent than atheists

[Pat Mustard]

https://phys.org/news/2017-08-atheists-t...ellow.html

I thought I'd just pick up a random article and post it...

Atheists are less open-minded than religious people, study claims | The Independent

And here is another one from the same source as the OP.

Even with all the flaws of the research posted in the OP it's substantially better than the "study" you're linking to. Work done by rcc researchers in the most catholic university in Europe is inevitably going to toe the line of "we have the conclusion, now lets find something to support it".

My reading of the whole situation is not that atheists are more intelligent (at least in a way that is statistaclly significant), but that they are better educated, especially in critical thinking (the tools which allow you to deconstruct an argument anf find flaws, logical inconsistencies and outright lies), thus why you see university educated people likely to be atheist and post grads even more likely still.