Q. If I wanted to become a Mormon would I have to believe in the Curse of Cain or anything similar to that?
A. The short answer is: No. Believing that the Priesthood ban was of God is technically not a requirement for membership in the Church. When one requests baptism into the Church they are not asked if they believe it; only if they believe that Jesus Christ is their Savior, and if they believe Joseph Smith was a true Prophet of God, that the LDS Church is true, and if they repent of their sins. When one goes to get a temple recommend, which allows a person to worship in an LDS Temple and receive the ordinances therein (including the sealings), he or she is not asked about this. He or she is asked if they are worthy, obey Church laws, keep the Word of Wisdom, and if they sustain the current President of the Church as a “Prophet, Seer, and Revelator”. If the candidate answers yes to these questions, he or she is given a temple recommend; which allows them all the blessings offered by the Church. They are never asked if they believe in or accept the Curse of Cain doctrine. A person can be an active Latter-day Saint in good-standing with a temple-recommend and not believe or accept the Curse of Cain doctrine.