Christianity is defined (as far as Iâm concerned) as a follower of Christ; thatâs where the word âChristianâ comes from. Their formal name is The Church of Jesus Christ of Latter-day Saints. It sounds like they follow Jesus to me.
If the LDS today could have been there at Antioch when the word Christian was first used, and told the apostles that âwe believe that Christ and the Devil are brothersâ, the apostles would have been like

x 666.
They would not have considered the LDS visitors to be Christian.
Acts 11:25-26
5 So Barnabas went to Tarsus to look for Saul; 26 and when he had found him, he brought him to Antioch. For a whole year they met with[a] the church, and taught a large company of people; and in Antioch the disciples were for the first time called Christians
Luke 4:3-4 is kind of an interesting verse. If the Devil and Jesus were brothers, wouldnât the devil know who he wasâŚhe wouldnât say âifâ. Heâd say âyou ARE the Son of GodâŚâ or âyou are my brother, a God just like meâŚâ
3 The devil said to him, âIf you are the Son of God, command this stone to become bread.â
No where in scripture does the Devil refer to Jesus as his brother, nor does Jesus ever refer to the Devil as his brother. No, the disciples & apostles would say certainly not, that the LDS visitors were Christian. Aside from there being men living on the moon and on the sun, this is the most bizzare belief of LDS theology.
PnP