This is interesting - and done per a scientific sampling - a survey of 1,000 Oklahomans was conducted online using a curated scientific sample of the state’s estimated 2.3 million unchurched. Respondents were asked a wide variety of questions, including queries about their religious participation, esoteric and spiritual beliefs, worldview paradigms, and demographics.
https://www.christianitytoday.com/edste ... tland.html
I would suspect that the farther west, north and east one goes in the U.S., this survey's numbers would show considerably less spiritual or Christian faith.