Mosiah 3:16 - 3:20
Mosiah 3:16 And even if it were possible that little children could sin they could not be saved; but I say unto you they are blessed; for behold, as in Adam, or by nature, they fall, even so the blood of Christ atoneth for their sins.
The atonement also applies to little children. Because little children cannot sin, their sins are automatically covered by Christ’s sacrifice. This in spite of their committing sins of various kinds. [Little kids can be mean to each other and even know they are doing wrong. However, their sins are covered by the atonement. They get a free pass because of their age until the age of accountability which in our doctrine in eight years of age.]
Mosiah 3:17 And moreover, I say unto you, that there shall be no other name given nor any other way nor means whereby salvation can come unto the children of men, only in and through the name of Christ, the Lord Omnipotent.
To sum up, coming to Christ is the only way to obtain salvation. Living the law of Moses will not do it. The law pointed to Christ and therefore one must find out about the gospel and live it to return to God. Only Christ has the instruction book and the rules one must comply with to get into heaven.
Mosiah 3:18 For behold he judgeth, and his judgment is just; and the infant perisheth not that dieth in his infancy; but men drink damnation to their own souls except they humble themselves and become as little children, and believe that salvation was, and is, and is to come, in and through the atoning blood of Christ, the Lord Omnipotent.
Christ will be the judge of men as to how well they complied with His gospel. The infant who dies before accountability will be excused, but those who die after that time will have to account for all their actions to the Lord himself. In fact it is the attitude of innocence that little children have that an adult should have for the atonement to apply to them. The proud and the unteachable are the ones who will not pass into heaven except they pay for their own sins.
Mosiah 3:19 For the natural man is an enemy to God, and has been from the fall of Adam, and will be, forever and ever, unless he yields to the enticings of the Holy Spirit, and putteth off the natural man and becometh a saint through the atonement of Christ the Lord, and becometh as a child, submissive, meek, humble, patient, full of love, willing to submit to all things which the Lord seeth fit to inflict upon him, even as a child doth submit to his father.
The mortal has been an enemy to God from the day he was placed on this earth. He is an enemy in that it is harder for him to yield up his own passions and desires than it is to follow instructions from God. Unless he is willing to apply the atonement in his life and listen to the Holy Ghost and have the attitude of a little child who is willing to listen to his parents, he will not make it into heaven.
Mosiah 3:20 And moreover, I say unto you, that the time shall come when the knowledge of a Savior shall spread throughout every nation, kindred, tongue, and people.
And there will be a time when no one who has ever lived on the earth can escape from knowing about these things in relation to the Savior.