I recently received an email with a request for some help in understanding the relationship between Jesus and Satan (Lucifer). The LDS view is that Jesus and Lucifer are spirit brothers. Actually, according to LDS doctrine as I undertand it, all members of the human race on this planet are spiritual brothers and sisters, since we are all the spiritual offspring of the sexual union of Heavenly Father and a Heavenly Mother, just like Jesus and Lucifer. The following is my response. It is not exhaustive by any means, but I hope it states clearly and gives good evidence that Jesus is not Lucifer's brother, but rather Jesus is Lucifer's Creator! Here it is . . .
The question is whether one will choose to believe the Bible or the "prophets" and general authorities of the Mormon Church. There is a mountain of evidence in both the writings of LDS leaders and the Bible to show that what each teaches is in direct conflict with the other. So, if your co-worker wants the Mormon sources, a great help is a compilation of the writings of LDS leaders called In Their Own Words, edited by Bill McKeever. This has been very helpful to me. It's not a book that tries to explain what Mormons believe written by a non-Mormon. It's just a book of quotes from Mormon leaders compiled according to topics. Here is an example on the LDS explanation of the Virgin Birth of Jesus . . .
"Begotten means begotten; it means Christ's mortal body was procreated by an Eternal Sire; it means God is the Father of Christ, 'after the manner of the flesh' (1 Ne. 11:18)." --Bruce R. McConkie, Doctrinal New Testament Commentary 3:141. Cited in In Their Own Words, page 174. What McConkie is claiming (among many, many other Mormon leaders) is that the Father both spiritually and physically begot Jesus through a sexual union with a female, in other words, the Father himself came to earth and had sex with Mary, and Jesus was the product of this physical union. In the eyes of biblical Christianity, this is blasphemy.
Concerning the question of Jesus' relationship to Satan, the Mormon position is stated clearly on the pro-LDS website fairmormon.org. On the page dealing with the question, "Do Latter-day Saints consider Jesus to be the brother of Satan?" is the following partial quote . . .
"Jesus, Satan, and all humanity share God the Father as their spiritual sire. However, moral agency led Jesus to obey God the Father perfectly and share fully in the Father's divine nature and power. The same agency led Satan to renounce God, fight Jesus, and doom himself to eternal damnation. The remainder of God's children—all of us—have the choice to follow the route chosen by Satan, or the path to which Christ invites us and shows the way.
Divine parenthood gives all children of God potential; Christ maximized that potential, and Satan squandered it."
The link for this page is . . . http://en.fairmormon.org/Jesus_Christ/Brother_of_Satan.
The essence of the message of Christianity is at stake. If we are all "spiritual children" produced by a sexual union between the Father and some Heavenly goddess Mother, including Jesus and Lucifer, then the Bible cannot possibly be true. The Bible presents Jesus as existing eternally as the second person of the Godhead, and in the Incarnation (His coming to earth as a human), both fully God and fully human. The following attributes and characteristics are taught in Scripture about Jesus . . .
He was with God in the beginning (John 1:1-2)
He was God in the beginning (John 1:1)
He created everything that has ever been created, including Satan (John 1:2-3; Colossians 1:16), when God claims to have created everything by Himself (Isaiah 44:24)
He is eternal as evidenced by His presence during the days of Abraham and the meaning of His Name, I AM (John 8:52-59)
He is the fullness of Deity (Colossians 1:19; 2:9)
He is the before all things, and the One by whom all things hold together (Colossians 1:17)
He is worshiped by the Apostle Thomas as Lord and God (John 20:28)
He is glorified by God the Father as God (John 8:54) when the Bible is clear God will not share His glory with another (Isaiah 42:8; 48:11)
He is called God by the Apostle Paul (Titus 3:5)
He is called God by the Apostle Peter (2 Peter 1:1)
He was rejected by the Jewish religious leaders because they understood that He was claiming to be God, not just a god (John 5:18; 10:33)
Here is a link to a great web site to help with this topic . . . http://www.alwaysbeready.com/index.php/deity-of-christ/94
There are many other passages that could be listed that clearly teach that Jesus is the eternal, uncreated God, the 2nd person of the Trinity, the Agent of Creation Who created everything that has ever been created. The only possible way that Jesus can be both God and the Son of God is the reality of the Trinity. That is, God exists as one God in Three Persons: God the Father, God the Son, and God the Holy Spirit. Jesus is God, but He is distinct in personality and personhood from the Father and from the Holy Spirit. The Holy Spirit is God, but He is distinct in personality and personhood from the Father and from the Son.
That's Who Jesus is. Lucifer is a fallen angel, a created being, absolutely different and distinct from Jesus in essence. Jesus is God the Creator. Lucifer is a rebellious created being. They do not share the same essence. One is Creator, the other is creature.