I contend that the death of Jesus was not an atonement sacrifice to pay for the sins of humanity.
So what was it for?
In Isaiah and Jeremiah God says he did not and still didn't require sacrifices.
Perhaps this is because the sacrifice is not meaningful in itself. Sacrifices were performed ever since the first sin. Maybe you should ask, "why did Able's sacrifice count and not Cain's?" The humble attitude of acknowledging one's sin before God is what it was all about. The sacrifices began as a symbol to teach the people the one who would remove the sin.
I don't believe God was angry at the people addressed in the passages listed because they were giving sacrifices, but because they were performing it as a meaningless ritual instead of acknowledging their sins to God. Sure, God could have cared less about the sacrifices themselves, it is the state of mind that counts. Since they were in they wrong state of mind they were vain hypocrits and God showed his disapproval.
Since God did not require sacrifices to atone for sins, Jesus could not be an atonement sacrifice.
God required only ONE sacrifice. Christ died ONCE for the sins of ALL humanity. The animal sacrifices were only symbols of the atoning sacrfice to come.
I have yet to find any true messianic prophecy that claims any anointed one was to die so that God would forgive the sins of humanity.
Does Isaiah 52-53 count?
See, my servant will act wisely; he will be raised and lifted up and highly exalted. Just as there were many who were appalled at him -- his appearance was so disfigured beyond that of any man and his form marred beyond human likeness -- so will many nations marvel at him, and kings will shut their mouths because of him. For what they were not told, they will see, and what they have not heard, they will understand.
Who has believed our message and to whom has the arm of the Lord been revealed? He grew up before him like a tender shoot, and like a root out of dry ground. He had no beauty or majesty to attract us to him, nothing in his appearance that we should desire him. He was despised and rejected by men, a man of many sorrows, and familiar with suffering. Like one from whom men hide their faces he was despised, and we esteemed him not.
Surely he took up our infirmities and carried our sorrows, yet we considered him stricken by God, smitten by him, and afflicted. But he was pierced for our transgressions, he was crushed for our iniquities; the punishment that brought us peace was upon him, and by his wounds we are healed. We all, like sheep, have gone astray, each of us has turned to his own way; and the Lord has laid on him the iniquity of us all.
He was oppressed and afflicted, yet he did not open his mouth; he was led like a lamb to the slaughter, and as a sheep before her shearers is silent, so he did not open his mouth. By oppression and judgment he was taken away.
...for the transgression of my people he was stricken... It was the Lord's will to crush him and cause him to suffer and though the Lord makes his life a guilt offering... After the suffering of his soul, he will see the light of life and be satisfied; by his knowledge my righteous servant will justify many, and he will bear their iniquities... He poured out his life unto death, and was numbered with the transgressors. For he bore the sin of many, and made intercession for the transgressors.