Whether we were delivered from sin through Christ's Passion?

Objections

Objection 1 : It would seem that we were not delivered from sin through Christ's Passion. For to deliver from sin belongs to God alone, according to Is. 43:25: "I am He who blot out your iniquities for My own sake." But Christ did not suffer as God, but as man. Therefore Christ's Passion did not free us from sin.
Objection 2 : Further, what is corporeal does not act upon what is spiritual. But Christ's Passion is corporeal, whereas sin exists in the soul, which is a spiritual creature. Therefore Christ's Passion could not cleanse us from sin.
Objection 3 : Further, one cannot be purged from a sin not yet committed, but which shall be committed hereafter. Since, then, many sins have been committed since Christ's death, and are being committed daily, it seems that we were not delivered from sin by Christ's death.
Objection 4 : Further, given an efficient cause, nothing else is required for producing the effect. But other things besides are required for the forgiveness of sins, such as baptism and penance. Consequently it seems that Christ's Passion is not the sufficient cause of the forgiveness of sins.
Objection 5 : Further, it is written (Prov. 10:12): "Charity covereth all sins"; and (Prov. 15:27): "By mercy and faith, sins are purged away." But there are many other things of which we have faith, and which excite charity. Therefore Christ's Passion is not the proper cause of the forgiveness of sins.