Was the gospel of Jesus Christ known to Adam and his posterity?

D. Kelly Ogden, associate professor of ancient scripture, Brigham Young University. The gospel and ordinances of the priesthood of God were on the earth from the beginning. Adam and Eve taught their children the principles of salvation and the plan of redemption. “In the beginning was the gospel preached through the Son. And the gospel was the word.” (JST, John 1:1.)

“And thus the Gospel began to be preached, from the beginning, being declared by holy angels sent forth from the presence of God, and by his own voice, and by the gift of the Holy Ghost.

“And thus all things were confirmed unto Adam, by an holy ordinance, and the Gospel preached.” (Moses 5:58–59; see also Moses 6:52–67.) The plurality of Gods, our spiritual premortal existence, the importance of moral agency, the role of Satan, the eternal nature of marriage, the priesthood and its blessings, the role of the Holy Ghost, the law of sacrifice, the principles, covenants, and ordinances of the gospel, knowledge of a Redeemer to come—these principles and more were all known from the beginning.