https://www.pewresearch.org/religious-landscape-study/religious-family/nondenominational-family-mainline-trad/
Nondenominational Protestants in the mainline tradition | Religious Landscape Study (RLS) | Pew...
The Religious Landscape Study is a comprehensive survey of more than 35,000 Americans' religious identities, beliefs and practices that's been conducted in...
nondenominational protestantsmainline
https://www.pewresearch.org/religion/2025/02/26/religious-landscape-study-religious-identity/pr_2025-02-26_religious-landscape-study_01-06/
Among Protestants, share who are nondenominational has doubled since 2007 | Pew Research Center