You really think that the whole gospel can be summarized in one verse that is not even in the Gospel?
How does Christ becoming sin make us the righteousness of God in Him?
2Cor.5
[17] Therefore, if any one is in Christ, he is a new creation; the old has passed away, behold, the new has come.
[18] All this is from God, who through Christ reconciled us to himself and gave us the ministry of reconciliation;
[19] that is, in Christ God was reconciling the world to himself, not counting their trespasses against them, and entrusting to us the message of reconciliation.
[20] So we are ambassadors for Christ, God making his appeal through us. We beseech you on behalf of Christ, be reconciled to God.
[21] For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.
The how is a good question that we may not understand this side of the veil. However we see the use of the scapegoat in the Law that forshadowed how He would take our sins. He is the Passover Lamb, which, as you recall, had to be perfect and unblemished.
I agree with you that taking one verse out of scripture and calling it “the gospel” is a very dangerous matter. None of the parts can be separated from the whole.
The Apostles taught that we are joined with Him in His death and resurrection through baptism. In this way, we die with Him, so that the righteousness of God can live in us.
How this happens is a great mystery of our faith. We are joined with Him in His death in baptism, and raised with Him in new life. The Spirit helps us in our weakness, so it is no longer we who live, but Christ who lives in us.
If Christ made satisfaction by keeping the law perfectly, why did He have to die? He kept the law perfectly already when He was alive so why the need for such an ignominious death?
Please provide Biblical support for the highlighted verse.
Heb.5
[1] For every high priest chosen from among men is appointed to act on behalf of men in relation to God, to offer gifts and sacrifices for sins.
[2] He can deal gently with the ignorant and wayward, since he himself is beset with weakness.
[3] Because of this he is bound to offer sacrifice for his own sins as well as for those of the people.
[4] And one does not take the honor upon himself, but he is called by God, just as Aaron was.
[5] So also Christ did not exalt himself to be made a high priest, but was appointed by him who said to him, “Thou art my Son,
today I have begotten thee”;
[6] as he says also in another place, “Thou art a priest for ever,
after the order of Melchiz’edek.”
[7] In the days of his flesh, Jesus offered up prayers and supplications, with loud cries and tears, to him who was able to save him from death, and he was heard for his godly fear.
[8] Although he was a Son, he learned obedience through what he suffered;
[9] and being made perfect he became the source of eternal salvation to all who obey him,
Do you not believe that Jesus perfect obedience was pleasing to the Father? If I am following you, you are making the point that, if perfect obedience to the law made satisfaction, he would have no reason to die?
His perfect satisfaction through the keeping of the Law was an expression of His unblemished nature, which was given for us as the sacrificial lamb.
Everything about Christ has to do with our salvation. So why is it then that you accept some of what Christ has said and willed and chose to disregard the others if you are convinced that the full message must be delivered.
I think you hit this nail on the head. I was shocked when I read from one of our Reformed brethren on CAF that Jesus did not really have much to say that is relevant to our salvation.
