In Nephi's vision, the angel said to him,
thou knowest concerning the covenants of the Lord unto the house of Israel; and thou also hast heard that whoso repenteth not must perish. Therefore, wo be unto the Gentiles if it so be that they harden their hearts against the Lamb of God . . . Rememberest thou the covenants of the Father unto the house of Israel? . . . Behold there are save two churches only, the one is the church of the Lamb of God, and the other is the church of the Devil" (1 Nephi 14:5, 10)
Elder Bruce R. McConkie has written: "There is only light and darkness; there is no dusky twilight zone [in regard to covenant salvation]. Either men walk in the light or they cannot be saved. Anything less than salvation is not salvation. It may be better to walk in the twilight or to glimpse the first few rays of a distant dawn than to be enveloped in total darkness, but salvation itself is only for those who step forth into the blazing light of the noonday sun." (The Millennial Messiah, p. 54).
According to Joseph McConkie and Robert Millet, many in the religious world claim that no church is better than any other, just different. As "all roads lead to Rome," it is reasoned that all beliefs must lead to heaven. If all religious paths do indeed lead to heaven, the righteous will be at a considerable disadvantage. If the gates of the celestial city are to be thrown open that widely, why the need for Apostles and prophets, their doctrines, their priesthood and keys; indeed, why the need for the Savior himself and a strait and narrow way? The doctrine of one true church is as offensive to much of the Christian world today as was the testimony of Christ anciently that he was "the way, the truth, and the life" (John 14:6). [Joseph Fielding McConkie and Robert L. Millet, Doctrinal Commentary on the Book of Mormon, Vol. I, pp. 109, 111]
Note* There is only one true way to eternal life and that is by obedience to valid covenants. That is what the Book of Mormon testifies. When one comes to an understanding of the Lord's covenant process of salvation, what great things the Lord did with our fathers in bringing them to a knowledge of this covenant process, and that this message is being sent forth to all the world, then one can not help but become convinced that Jesus is the Christ, the Eternal God, manifesting himself unto all nations (see the Title Page) [Alan C. Miner, Personal Notes]