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A cult has qualified itself as such when they base an entire doctrine on one or two verses. It always leaves an open door for errors on translation and/or to take it out of context. Paul asked the Corinthians why they were baptizing their dead when they didn’t believe in the resurrection to begin with. Most of chapter 15 was the argument of Paul in defense of the resurrection of Jesus Christ.
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“Point 16. The true church must practice baptism for the dead. 1 Cor. 15:16 and 29.”