The atonement is our rescue. Christ alone performed it and He has proclaimed that He alone has accomplished it:
Isaiah 63:3: “I have trodden the winepress alone; and of the people there was none with me[.]”
In modern revelation, He has reiterated that He alone performed the atoning sacrifice required to save us from judgment and condemnation:
D&C 133:50: “I have trodden the wine-press alone, and have brought judgment upon all people; and none were with me;”
He saves us through the atonement because He paid the price of the wrath of Almighty God for all sin:
D&C 76:107: “I have overcome and have trodden the wine-press alone, even the wine-press of the fierceness of the wrath of Almighty God.”
Paul explained that through the original disobedience of Adam, a sentence of death was imposed on mankind, but that sentence was reversed and many will be made righteous by the sacrifice of Christ. (See Romans 5:12-19.)
It is Christ alone who will keep the way. He will allow those who have believed in Him, obeyed Him, kept His commandments and thereby walked in the path of His righteousness (to become righteous) to enter:
2 Nephi 9:41: “O then, my beloved brethren, come unto the Lord, the Holy One. Remember that his paths are righteous. Behold, the way for man is narrow, but it lieth in a straight course before him, and the keeper of the gate is the Holy One of Israel; and he employeth no servant there; and there is none other way save it be by the gate; for he cannot be deceived, for the Lord God is his name.”
It is Christ and His name alone which will provide salvation for mankind:
Mosiah 5:8 “And under this head ye are made free, and there is no other head whereby ye can be made free. There is no other name given whereby salvation cometh; therefore, I would that ye should take upon you the name of Christ, all you that have entered into the covenant with God that ye should be obedient unto the end of your lives.”
John 14:6: “Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.”
There are many others in heaven. God the Father and Christ are not alone. There is an entire host of beings with them:
Neimiah 9:6: “Thou, even thou, art Lord alone; thou hast made heaven, the heaven of heavens, with all their host, the earth, and all things that are therein, the seas, and all that is therein, and thou preservest them all; and the host of heaven worshippeth thee.”
Some of the hosts are righteous, align with God, and follow His will:
D&C 88:112: “And Michael, the seventh angel, even the archangel, shall gather together his armies, even the hosts of heaven.”
Angelic hosts are on both sides, some on God’s right hand and others on His left:
2 Chronicles 18:18: “Again he said, Therefore hear the word of the Lord; I saw the Lord sitting upon his throne, and all the host of heaven standing on his right hand and on his left.”
1 Kings 22:19: “And he said, Hear thou therefore the word of the Lord: I saw the Lord sitting on his throne, and all the host of heaven standing by him on his right hand and on his left.”
But angelic hosts retain the right to choose. It is possible for them to rebel and fall short. It is possible for angelic hosts to be cast down from heaven:
D&C 29:36: “And it came to pass that Adam, being tempted of the devil—for, behold, the devil was before Adam, for he rebelled against me, saying, Give me thine honor, which is my power; and also a third part of the hosts of heaven turned he away from me because of their agency;”
Faithful members of the heavenly hosts can further God’s work, and cooperate with Him in assisting mankind:
D&C 84:42: “And wo unto all those who come not unto this priesthood which ye have received, which I now confirm upon you who are present this day, by mine own voice out of the heavens; and even I have given the heavenly hosts and mine angels charge concerning you.”
We cannot be saved by an angel. Nor can we trust any angel, even from heaven, to be the object of worship or adoration. That must be reserved for Christ and His Father alone:
Galatians 1:8: “But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.”
Even if an angel were to give you a covenant, promise or assurance; or a man were to “seal you up to eternal life,” unless it comes by and through Christ alone, it will be of no value in the afterlife:
D&C 132:12-13: “I am the Lord thy God; and I give unto you this commandment—that no man shall come unto the Father but by me or by my word, which is my law, saith the Lord. And everything that is in the world, whether it be ordained of men, by thrones, or principalities, or powers, or things of name, whatsoever they may be, that are not by me or by my word, saith the Lord, shall be thrown down, and shall not remain after men are dead, neither in nor after the resurrection, saith the Lord your God.”
Those who worship angels, men, or institutions instead of Christ risk becoming subject to a fallen angel:
2 Nephi 9:8: “O the wisdom of God, his mercy and grace! For behold, if the flesh should rise no more our spirits must become subject to that angel who fell from before the presence of the Eternal God, and became the devil, to rise no more.” (See also D&C 76:98-105.)
One of the adversary’s pretensions is to claim that he is “the son of God” or the “Only Begotten,” thereby hoping to mislead people to worship him instead of the Lord. (See Moses 1:19; D&C 128:20.)
Before accepting a message as truth, you ought to know the scriptures well enough to test the message against the words of Christ, His unwaivering voice from the time of Adam until the present, and the prophets. It should not be difficult to determine if some new thing is true or just vanity, without power, and offensive to God. You should be careful about allowing any angel or man to pretend to “seal you up” to some eternal reward. You may find yourself subject in the afterlife to a vile spirit who will claim the right to rule over you. There are pretenders, even among the hosts of heaven. Joseph Smith cautioned, “A man is saved no faster than he gets knowledge, for if he does not get knowledge, he will be brought into captivity by some evil power in the other world, as evil spirits will have more knowledge, and consequently more power than many men who are on the earth. Hence it needs revelation to assist us, and give us knowledge of the things of God.” (DHC 4:588.)
Believe in Christ, trust in Him, and seek salvation through Him alone.