- tradition
- because it worked for previous generations: America became one of the best countries to live in while being religious
- I guess some people also shared my experience that it worked, despite how unreasonable it seems. (Yes, this means I am an engineer who discuss evolution with you guys and have studied a tiny bit of astrophysics, but still pray to God and is heavily influenced by what I read. It kind of works like wave particle dualism: I use the model that works for the situation.)
Religion is a codified belief system while science is a codified knowledge discovery system. They cohabitate just fine until one is mistaken for the other.
Maybe some in the us use religion to explain why they should be in a privileged position compared to others?