This is a very interesting article. As so often, religion is not mentioned, only in the comments.
“The inflexible person, for instance, has trouble assimilating new knowledge,” Stanovich says. “People with a high need for closure shut down at the first adequate solution. Coming to a better solution would require more cognitive effort.”
By adequate, we have to assume Stanovich also means to infer "happy" or "contenting" solution.
I can't see how belief (or not) requires a serious amount of thought or reasoning. The effort comes in breaking the programme you've been given by your parents and peers.
I am convinced that any religious belief, that persists during adult life, is caused by some kind of a dysfunction of the brain. It is either an inability to think rationally as is dysrationalia or it is an urge or need strong enough to override rationality as a delusion.
Full mental health means the absence or religion. Religion indicates the lack of full mental health.
Thanks; I had read the article a couple of years ago, and it was good to revisit it.