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Foregoing the whole heretical teaching of the preexistence for mankind, explain to the Mormon the word Christ is a title, not a name. The next item you’ll want to address is their belief Jesus is Jehovah. Kindly share the definition of this word, and ask why they believe LDS teachings in light of what this means. The Mormon Jesus is a created being, and obviously can’t be self-existent.
The transliteration for Jehovah is yhwh which means (the) self-Existent or Eternal; Jehovah, Jewish national name of God :- Jehovah, the Lord. Compare <H3050> (Yahh), <H3069> (Yehovih).
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Journal of Discourses 26:300 “We learn that our Savior was born of a woman, and He was named Jesus the Christ. His name when He was a spiritual being, during the first half of the existence of the earth, before He was made flesh and blood, was Jehovah. He was in the beginning of the creation, and He had to do and has had to do continually with the creation and government of this heaven and this earth.” — Franklin D. Richards, Provo, August 30, 1885