I'm guessing Michigan is only as low as it is because of the bigger cities like Detroit and Flint. A lot of the smaller towns are super religious. I'm also surprised that Indiana is as low as it is. My parents live there and it is very religious.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell