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These links should be helpful in refuting Seventh-Day Adventists. CAF staff apologist Michelle Arnold grew up as an Adventist and has also written on the topic for Catholic Answers. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
*]Why do Catholics worship on Sunday?
*]Sabbath or Sunday?
*]From Sabbath to Sunday by James P. Guzek
Further reading: Why do the Seventh Day Adventists attack the Catholic Church?