For the people who dont understand what IQ is, imagine comparing the inteligence of two people as the same as comparing the fighting capacity of two martial arts warriors in battle. A higher IQ would represent a higher muscle strenght, not technique or karate skills. Who would win the fight? any of them. IQ is only measuring your Complex Abstraction ¨lifting¨ capabilities, how much complexity can you hold in your brain at any given time, not your actual overall inteligence.
It does not represent by any means if a person deserves awards or respect or love or if it is spiritual or even sane or coherent or wise or educated.
I believe religion is a place where a person goes when he/she cant find the answers that he/she needs anywhere else. Every person is different, so every person needs different answers, and some need a lot while some others just need a few.
So i would think the tendency is that smarter people in general is able to find the answers he/she needs without having to recur to religion.
But the definition itself of a god is very ambiguos. Two differnet persons who believe in god will probably say to each other ¨we are two believers¨, but the actual concept or idea they have about god in their minds will probably be completly different.
I have my own explanation or idea of what i am, what my soul is and so on, but i dont consider myself a believer.
The thing is, the only thing i need to be recogniced as a believer is to call all my ¨explanations¨ as ¨God¨, wich is just semantics AND to follow all the social conventions that been religious imply.
What is the difference between ¨The explanation of everything¨(in the most broad sense posible) and ¨God¨ besides letters?
My personal conclusion its than a person been religious or not depends on his/her personality, lenguage and social enviorement. Its a cultural thing.
A person who doesnt need answers nor the social support of his social enviorement religious mates, will break free to do whatever he actually needs to do with his mind , hearth and body.
The problem with materialism is that it's self-refuting.
The difficulty with theism is the problem of evil. While the problem is not insurmountable, it can't be fully explained.
The above link is the best, most concise explanation of the problem that I've read.