The religious beliefs and practices of the followers of Alexander Campbell, a 19th-century religious reformer who founded the Disciples of Christ movement.
From the personal name 'Campbell' plus '-ism', a suffix creating a noun for a system of beliefs or ideology, named after Alexander Campbell (1788–1866).
Campbellism tried to strip Christianity down to its 'original' form by rejecting creeds—a goal that sounds pure but assumes ancient texts are clearer than centuries of interpretation, which is its own kind of assumption.
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