https://www.pewresearch.org/religious-landscape-study/religious-family/congregationalist-family-mainline-trad/
Congregationalists in the mainline tradition | Religious Landscape Study (RLS) | Pew Research Center
The Religious Landscape Study is a comprehensive survey of more than 35,000 Americans’ religious identities, beliefs and practices that’s been conducted in...
pew research centerin thereligious landscapecongregationalistsmainline