a creature is limited, can not atone for another ( Hebrews 7-10 )
Jesus is fully man and fully God as such he is infinite and can atone for all mankind.
The suggestion that some innocent man, or angel, might possibly pay the debt incurred by sinners is rejected, on the ground that in any case this would put the sinner under obligation to his deliverer, and he would thus become the servant of a mere creature. The only way in which the satisfaction could be made, and men could be set free from sin, was by the coming of a Redeemer who is both God and man. His death makes full satisfaction to the Divine Justice, for **it is something greater than all the sins of all rnankind. **Many side questions are incidentally treated in the dialogue between Anselm and Boso. But this is the substance of the answer given to the great question, “Cur Deus Homo?”. Some modern writers have suggested that this notion of deliverance by means of satisfaction may have a German origin.
Eze 18 brings out the principle that a creature, man can not be righteous for another creature, man.
There is no scripture that says an angel can make atonement for another, otherwise Satan would be able to repent and be saved.
Is there any scripture that a mere creature can atone sufficently for all mankind’s sins? for all time?
Lets’ develop the argument that only Jesus as fully man and fully God is sufficent atonement for all mankind.
Quotes from church fathers, theologians, scripture.