(1980 and 2005).

In 2010, Adventism claimed to have some 22 million believers who were scattered in various independent churches. The largest church within the movement--the Seventh-day Adventist Church--had more than 23 million members in 2025.

History

Adventism began as an inter-denominational movement. Its most vocal leader was William Miller. Between 50,000 and 100,000 people in the United States supported Miller's predictions of Christ's return. After the "Great Disappointment"

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