The challenges of creating a religious typology - Pew Research Center: Q&A

Pew Research Center surveys on religion in the United States typically sort Americans by their religious affiliation (or lack of affiliation). But our latest report looks at religion in America in a different way. This new analysis creates a typology that cuts across denominations, sorting Americans into seven groups, or "clusters," based on their religious and spiritual beliefs and practices, the value they place on their religion, and the sources of meaning and fulfillment in their lives. ....
http://www.pewresearch.org/fact-tank/2018/08/29/religious-typology-q-and-a/