Infinitum
Possessed Bookworm
Skipping the fact that IQ as a measure is practically obsolete in real life, let's look at the explanation to why intelligence and non-religiosity goes hand in hand. The answer seems pretty obvious to me, so I don't quite understand the fuss about it.
The thing is, intelligence as we usually talk of it is of the logic-mathematical type. This means people with a higher IQ are better than average at grasping logical or mathematical topics. They also have a tendency to use logic to solve their problems. This means that if these people aren't able to find any sound reasoning for believing in God (or anything else at that matter) they will become atheist or agnostic. As I'm sure we all know there are plenty of problems with mainstream religions, Christianity being the most obvious example. Some other religions, like Judaism, allow for a much more intellectual approach and therefore retain more people who think in logic-mathematical terms. That's all there is to it.
The thing is, intelligence as we usually talk of it is of the logic-mathematical type. This means people with a higher IQ are better than average at grasping logical or mathematical topics. They also have a tendency to use logic to solve their problems. This means that if these people aren't able to find any sound reasoning for believing in God (or anything else at that matter) they will become atheist or agnostic. As I'm sure we all know there are plenty of problems with mainstream religions, Christianity being the most obvious example. Some other religions, like Judaism, allow for a much more intellectual approach and therefore retain more people who think in logic-mathematical terms. That's all there is to it.