[Adam the Fish]

Maybe this is true as an average.

But (non-)religious people hold views for different reasons and these don't always necessarily correlate with one thing.

As such, I'd never automatically assume a religious person less intelligent than a non-religious person and vice versa.

In terms of my personal observations, most of my friends are highly intelligent, however it might be fair to say that those indoctrinated with religion who have not yet got past the bull might seem less outgoing and intelligent.
I wonder whether this is correlated in less intelligent -> religious, religious -> less curious, not seeking alternative answers, or not at all correlated.

Whatever, I'd never judge a person on their religion.
What they do in the name of it (blowing up innocent people, etc.) or its influence on their personality (being narrow-minded, etc.) is something I might judge them on more.