Redemption has many facets. It is not enough that people know about good and evil. This understanding is insufficient to do the two things necessary to bring us to God. The first is to free us of the condemnation we have as heirs of Adam’s sin and the second is to free us from our own sinful condition.
Freeing us and others from the eternal consequences of Adam’s sin required a life of perfect obedience to the Father that Adam could not accomplish. Jesus lived out for us the perfect life that is beyond our own capabilities. Thus, by faith in Jesus we can be freed from the bondage and consequences of Adam’s sin.
What has been provided to Christians through Jesus’ life, death and resurrection was offered, I believe, to some people before Jesus came to earth through the means we read about in the Old Testament.
When Abram’s name was changed to Abraham it began the process of widening God’s offer of faith and forgiveness to larger groups of people. When we get to Moses, God’s offer continues to widen. However, the fundamental requirements of faith and forgiveness continue. Paul tells us that the Mosaic Law does not save anyone but directs people to the need for faith and forgiveness.
The Mosaic Law stayed in effect until Jesus fulfilled it. Now we have a New Covenant but, I believe, it is as impossible for me to live up to it on my own as it would be for me to completely obey the Mosaic Law. The extent to which I am able to fulfill it depends on Christ’s gifts to me of faith, forgiveness, and the Holy Spirit.
For our own sins a sacrifice was required. This sacrifice Jesus offered for us by going to the Cross. What Jesus did is made effective in us by our repentance for our sins, our acknowledgment we are not able to present ourselves righteous before God by our own efforts, and our belief the Jesus Christ is the living Son of God. It is in this way we come to redemption.