You are so Ill informed about the Mormon religion that it is humorous. They absolutely do NOT believe what you stated above.
I should know...as I attended that church for about 5 years as a teenager. I don't believe a lot of their teachings. But your statement is beyond false.
I'd consider you to be the ill informed one. It's best not to question me on matters of religion as I'm actually an expert.
"Think of the *****, cursed as to the priesthood.... This *****, who, in the pre-existence lived the type of life which justified the lord in sending him to earth in the lineage of Cain with a black skin.... In spite of all he did in the pre-existent life, the Lord is willing, if the ***** accepts the gospel with real, sincere faith, and is really converted, to give him the blessings of baptism and the gift of the Holy Ghost. If that ***** is faithful all his days, he can and will enter the celestial kingdom. He will go there as a servant, but he will get a celestial resurrection. He will get a place in the celestial glory. He will not go then even with the honorable men of the earth to the Terrestrial glory, nor with the ones spoken of as being without law"
Like CWG said, these things didn't change until 1978.
When did Romney join the church? At birth in 1947. He was a mormon missionary in 1969, when these beliefs were still firmly in place.