Articles of Faith, pg. 63; “It has become a common practise with mankind to heap reproaches upon the progenitors of the family, and to picture the supposedly blessed state in which we would be living but for the fall; whereas our first parents are entitled to our deepest gratitude for their legacy to posterity—the means of winning title to glory, exaltation, and eternal lives. But for the opportunity thus given, the spirits of God’s offspring would have remained forever in a state of innocent childhood, sinless through no effort of their own; negatively saved, not from sin, but from the opportunity of meeting sin…From Father Adam we have inherited all the ills to which flesh is heir; but such are necessarily incident to a knowledge of good and evil, by the proper use of which knowledge man may become even as the Gods.” – James Talmage
Gen. 3:15; “And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.”
This clip of doctrine says it all about Mormonism. In reality believing there must be opposites to have a knowledge of good and bad is a form of Witchcraft.