The study is flawed from the beginning. Bad study. If you get a group of less IQ in the room, your outcome will be less no matter what. That’s to start with. I taught logic in the geometry classes at a Catholic high school. Top notch students who went on to be doctors, attorneys and scored high on entrance testing and IQ tests.
Also, a lot depends on the religion, the Church and the faith. Mormons and Catholics push education, higher education and learning. And yes, study things out, think on it, meditate on it, and then pray about it. If the answer is correct for you, do it. But it won’t be right for everyone. And, studies have shown certain Churches within a religion have very intelligent people and go on to highly intelligent careers.
Then of course, what is intelligence? How you define this may not be what I define it as. I’ve scene recently and it the past the mistakes and blunders of your atheist supposedly highly intelligent people. Today, most of them can’t define what a woman is. Yet, they sit on the Supreme Court of the United States. I’ve scene your highly atheistic tyrants who have committed genocide because logically it made sense to them in order to eradicate poverty. No thank you. I’ll take the ones of average intelligence who because they follow Jesus Christ have love and compassion in their hearts and can feel the Light of Christ’s truth and make right decisions.
One other thing, our American society is devolving into a lazy, violent and un thankful country as the level of faith in God declines. God is light, pure intelligence and truth. As we move away from God we will see more and more anarchy and violence.