I’m doubtful about that.

First, what is the definition of intelligence that the study used? Intelligence is a rather slippery subject that we humans really don’t understand yet.

Second, in my opinion religious belief and atheism are two sides of the same coin. That of faith. One side says there is a God, Allah to Zeus, take your pick. The other says there isn’t. Neither belief is demonstrable or provable in a scientific manner.

So, I’m doubtful about this study. I’ve known many believers who are at least as smart as I am, and just as many atheists.