I'll do my best.
This is from religion facts, just a site with the basic outlines of all religions:
That's saying that through our works, our deeds, we can earn our salvation.
Here's the 3rd Article of Faith:
These seem to contradict what Paul wrote when he said that we are saved by grace alone, so that no man may boast of his works. Now I'm not saying works are bad, they certainly are necessary. James says that our faith is dead if we have no works, but that does not mean that our works lead to salvation, but that grace leads to salvation which leads to works.
Now I'm reading a Mormon article from one of the leaders in 1981 on this subject, and I see more that contradicts the Bible. Apparently there is the belief that children cannot sin. This would contradict Romans 3:23, "For ALL have sinned and fall short of the glory of God." (Emphasis is mine). Our sinful, carnal nature does not allow us to earn our salvation through works, for the only way to earn it would to be perfect, and that is impossible.
Salvation is a wonderful gift that we have been given, don't folly and think that it's something you can earn. Take, accept the gift from Jesus Christ and follow his commandments, for He said, "If you love me you will obey me." (Jesus was kinda legalistic like that).