When people are highly religious i think they are less intelligent.
Whenever I find out somebody is highly religious I tend to judge that they are less intelligent.
I don't think this about people who simply have spiritual beliefs or believe in God or some other entities, especially if they have had experiences that made them believe that, but when I know somebody blindy follows a faith they were taught by others, or believe everything religious texts tell them, I cannot help but think they are not very smart.
I don't try to be judgmental and I will explain why I think this. There is no evidence that religious texts are anywhere near true and no religion has much evidence to back up anything at all. There is however overwhelming evidence that much of it is not literal. Anybody who researches something like te Bible will find out it has been altered throughout history.
If somebody cannot realize that at least most of this was created by men, they are not someone who thinks much. If you do not question everything you are told and just follow something you didn't learn on your own without evidence to back it up, then there is no way you can be that intelligent.
For the record I also do not think many people are intelligent either.