I’m faced with this question : Why Jesus had to come to earth, if Jews could obtain forgiveness for their sins through the sacrifice of lamb ?
What I think is the answer, is the difference between atonement and redemption.
Atonement - The act by which one’s sins are forgiven and he is cleansed from all its stains. Found in almost every religion, including heathen religions.
Redemption - The very plan of God the Father to redeem the entire mankind, for the sin that entered the world through the disobedience of one man.
Please correct me if I’m wrong.
Modern Catholic Dictionary:
REDEMPTION. The salvation of humanity by Jesus Christ. Literally, to redeem means to free or buy back. Humanity was held captive in that it was enslaved by sin. Since the devil overcame human beings by inducing them to sin, they were said to be in bondage to the devil. Moreover, the human race was held captive as to a debt of punishment, to the payment of which it was bound by divine justice.
On all these counts, the Passion of Christ was sufficient and superabundant satisfaction for human guilt and the consequent debt of punishment. His Passion was a kind of price or ransom that paid the cost of freeing humanity from both obligations. Christ rendered satisfaction, not by giving money, but by spending what was of the highest value. He gave himself, and therefore his Passion is called humanity’s Redemption. (Etym. Latin redemptio, a buying back, ransoming, redemption.)
ATONEMENT. The satisfaction of a legitimate demand. In a more restricted sense it is the reparation of an offense. This occurs through a voluntary performance that outweighs the injustice done. If the performance fully counterbalances the gravity of the guilt, the atonement is adequate. And if the atonement is done by someone other than the actual offender, but in his stead, it is vicarious.
Applied to Christ the Redeemer, through his suffering and death he rendered vicarious atonement to God for the sins of the whole human race. His atonement is fully adequate because it was performed by a divine person. In fact, it is superabundant because the positive value of Christ’s expiation is actually greater than the negative value of human sin. (Etym. Middle English at one, to set at one, to reconcile; of one mind, in accord.)