The most and least Christian states in the U.S. are...

The researchers found Utah to be the most Christian* state with around 78 percent of population identifying as Christian adherents. The researchers found Maine to be the least Christian state with only about 27 percent identifying as Christian adherents.

The researchers define adherents to be those with an affiliation to a congregation including children, members and attendees who are not members, and believe that the adherent measure is the most complete and comparable across religious groups. Congregations are defined as groups of people who meet regularly at a pre-announced time and location.