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Mormons believe Jesus is going to return to earth someday, but their understanding of where is totally different from what the Bible says.
The first time they prophesied of Jesus’ return they said it’d be in Kirtland, OH. Then it was Missouri, then Nauvoo, Illinois.
Use demonstrative evidence from your Bible to show them when Jesus returns, it’ll be in Jerusalem, not past Mormon headquarters, and not Utah.
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Article of Faith 1:10 “We believe in the literal gathering of Israel and in the restoration of the Ten Tribes; that Zion (the New Jerusalem) will be built upon the American continent; that Christ will reign personally upon the earth; and, that the earth will be renewed and receive its paradisiacal glory.”