Through Mormonism, Lucifer elevated himself to equality with Christ, for Mormons believe Lucifer to be the brother of Christ. You can hear the anger of jealousy by Lucifer echoed through the false religion (one of many) he started as a counterfeit here on earth.
For thou hast said in thine heart,
I will ascend into heaven,
I will exalt my throne above the stars of God:
I will ascend above the heights of the clouds;
I will be like the most High.
Isaiah 14:13,14