It would be more accurate to state that there is a strong corrolation between being a fundementalist/zealot (of any kind) and being uneducated.
The problem is not with being religious, it is with being uneducated. There are plenty of uneducated atheists in the world. Distribution of intelligence creates a bell curve. There are more uneducated religious people because there are more religious people. If you spliced out the fundementalists, I would expect the bell curve of intelligence within religion to look like the bell curve of the atheists.
Atheism does predispose you to particular behaviors, particularly to the behavior of claiming "I am an atheist." :)
It would be more accurate to state that there is a strong corrolation between being a fundementalist/zealot (of any kind) and being uneducated. The problem is not with being religious, it is with being uneducated. There are plenty of uneducated atheists in the world. Distribution of intelligence creates a bell curve. There are more uneducated religious people because there are more religious people. If you spliced out the fundementalists, I would expect the bell curve of intelligence within religion to look like the bell curve of the atheists.