The US is less religious than Africa, South America or the Middle East but more religious than pretty much everywhere else.

You forgot tiny irrelevant places like Indonesia, Bangladesh and India. Your statement only works if you define "pretty much everywhere" else as Europe and East Asian, about 2.5 billion people, a lot but not the majority on our world of 7 billion. Oh sure there are a few demographically irrelevant pockets in addition to that like say Australia or Canada, but thinking a bit about them and adding their populations together one has a hard time matching just Indonesia.