Just for those who do not want to trace back to the original question, I asked: “Why was Jesus’ sacrifice necessary? Could not God simply forgive the sin of Adam and Eve - despite his omnipotence?”
It’s not about forgiveness, but rather about restoring. The key word is
Atonement: “at-one-ment” in other words. It has to do with repairing something broken and satisfying justice. Analogy:
Say that someone invited you to a beautiful villa and the owner told you to make yourself at home, but instructed you not to go into a special private chamber. But while you were there you chose to go into the chamber and somehow managed to break a beautiful priceless heirloom mirror.
You could be sorry for breaking the mirror and apologize. But 3 things have happened: 1) You betrayed the trust of the owner by disobeying his request. 2) You broke something that was priceless which you have no way of paying back or repairing, and 3) The heirloom mirror can no longer pass on to the family.
In all justice, you would be responsible for repairing everything perfectly to what it was or better; yet you are in a tough position as it is impossible for you to restore the priceless heirloom.
Only someone who could repair the priceless heirloom mirror could save you from the predicament. You would need a savior who would act on your behalf.
God made Adam and Eve in God’s Image and Likeness. The original sin of Adam and Eve broke Man’s relationship with God. The penalty for sin is death, and all of Mankind inherited this condition. Sin separates us from God, and it distorts the image and likeness of God in us. The effects of Original Sin is that now we have a proclivity toward sin.
The Incarnation of the Second Person of the Trinity means that God became a Man, to suffer the consequence of sin on behalf of Man, thus God took flesh and offered the eternal sacrifice on the cross to make up for the sins of the world, sins of the past, sins of the present, and sins of the future.
Since finite Man was made to reflect God like a mirror reflecting the infinite Image and Likeness of God, only God Himself could act on behalf of Man in order to repair Man to that perfection. Thus by the life, death and resurrection of God’s only Begotten Son, Jesus Christ, Who is both God and Man, has purchased for us the rewards of Eternal Life.
In Genesis, right after Adam and Eve sinned through the deception of the serpent, God promises to send a
redeemer. The Old Testament was a preparation for the coming of the Redeemer, who would come through a Chosen People, chosen to prepare for the event which would culminate in Christ offering Himself on the altar of the cross, as the Lamb of God who would take away the sin of the world. His suffering, the and death atoned for all the sins which Man commits through the body.