We believe as it says in the 2Nephi 2:6,7;
6 Wherefore, redemption cometh in and through the Holy Messiah; for he is full of grace and truth.
7 Behold, he offereth himself a sacrifice for sin, to answer the ends of the law, unto all those who have a broken heart and a contrite spirit; and unto none else can the ends of the law be answered.
I have a firm testimony of this, that it is only in and through Jesus Christ that we can return to live with our Father in Heaven. I am so grateful for the atonement of Jesus Christ, through the atonement, not only can I be cleansed of my sins, but I will be ressurected along with everyone else. I will have an immortal body. Although we have this blessing to be saved, it does not come without something on our part. We have to be obedient to the laws and ordinances of the gospel. We have the Ten Commandments, tithing, the word of wisdom, but what are the ordinances? The first and ordinance of the gospel is baptism, it is also requisite to enter into the kingdom of God (John 3:5). Through following Gods laws, and recieving the necessary ordinances, we can through Jesus Christ be saved, and recieve eternal life.