I see you ignored my reply and now are deflecting ..... Hope you take time to read what other Christians also believe...
In regards to Lucifer being specifically the “brother of Jesus,” we can look to the Evangelical Christian theologian, H.L. Martensen. He believed that Lucifer was "Christ's younger brother, and became God's adversary because he was not content to be second, but wanted to be first; because he was unwilling to bear the light of another, and wanted to be the light itself."10 This idea is not new. In fact, Lactantius, a Latin Christian Father of the third century, taught the following: “Before creating the world, God produced a spirit like himself, replete with virtues of the Father. Later He made another, in whom the mark of divine was erased, because this one was besmirched by the poison of jealousy and turned therefore from good to evil. He was jealous of his older brother who, remaining united with the Father, insured his affection unto himself.”11 I submit the rhetorical question that—aside from the fact that the LDS doctrine is both scripturally and logically sound—if Gaebelein, Martensen, Lactantius, and others, could teach such a doctrine and still remain Christian, then how can members of the Church of Jesus Christ be branded as un-Christian for holding a similar belief?
Written by Michael G. Reed for the Foundation for Apologetic Information and Research