Denominations like the Seventh-day Adventists teach that it is essential for Christians to keep the Sabbath. The SDA church offers the best example for a thumbnail sketch of the problem.
Ellen G. White (1827-1915) was a founding member of the SDA Church. Her writings are considered to be divinely inspired by many SDA members. White taught that worship on Sunday was introduced by heretics in the Roman Catholic Church. She claimed that the Pope of the Roman Catholic Church is the Anti-Christ and Christians who worship on Sunday are under the mark of the beast.
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