It also depends on the region. Where I live there is a lot of Asian influence, so there are a lot of Eastern religious beliefs, usually blended a bit with Christian beliefs. Also, there are a lot of atheists. But in the south, I'd say 70% are very devoutly Christian of some sort (there are many different types of Christian with different beliefs) and the other 30% are basically Christian, though not really devout. The east coast has a lot of Middle East immigrants, so there are a lot of muslims there too. There are very few muslims by where I live.