As descendants of Adam and Eve, all people inherit the effects of the Fall. In our fallen state, we are subject to opposition and temptation. When we give in to temptation, we are alienated from God, and if we continue in sin, we experience spiritual death, being separated from His presence. We are all subject to temporal death, which is the death of the physical body (see Alma 42:6-9; D&C 29:41-42).
The only way for us to be saved is for someone else to rescue us. We need someone who can satisfy the demands of justice—standing in our place to assume the burden of the Fall and to pay the price for our sins. Jesus Christ has always been the only one capable of making such a sacrifice."