I'm not sure how much of a distinction this is, but isn't one of the differences between Mormons and Christians on the historical race issue is many Christians contorted a Bible verse or two to justify slavery, while the alleged inferiority of blacks was part of Mormon doctrine? I don't know that any major Christian denomination (Baptists, etc.) ever taught that Satan was black, the mark of Cain was black skin, blacks could not go to heaven, etc.? Maybe I'm splitting hairs . . . .
The Mormons have 3 levels of 'heaven', with the 'celestial kingdom' being the highest. As a male, you could not ascend to that highest level unless you held the 'priesthood' and prior to 1978, if you were non-White, the 'priesthood' was not available to you.
What you mention may be a difference between the two, but one thing that Mormons stress in their classes is that Jesus and Lucifer were brothers in a literal sense and furthermore, that
every single person who has ever lived or will live is also the literal brother or sister of both Jesus and Lucifer. Whether other Christian religions believe/teach that or not, I don't think anyone else dwells on it like the Mormons do.
The primary difference between Christians and Mormons, however, is that Christians believe God, Jesus, and the Holy Ghost to be one and the same, while Mormons believe that God (aka Heavenly Father), Jesus, and the Holy Ghost are 3 distinctly separate entities.