Matthew 26:28; “For this is my blood of the new testament, which is shed for many for the remission of sins.”
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The Messiah would be the new covenant…Mormons believe the new covenant is that of polygamy. How could an adulterous sexual relationship outside a monogamous marriage take the place of Jesus’ spilt blood on the cross for us? Ask a Mormon for their opinion on this, and explain the meaning of the word ‘everlasting’.
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D&C 132:4; “For behold, I reveal unto you a new and an everlasting covenant; and if ye abide not that covenant, then are ye damned; for no one can reject this covenant and be permitted to enter into my glory.” – Joseph Smith, July 12, 1843