2 Corinthians 5:21 For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God.

Let us be clear here.  For our sake he(Father God) made him(God the Son) to be sin.

Only God could stand up under the weight of that task.

Luke 18:27 But he said, “What is impossible with man is possible with God.”

Luke 18:26 Those who heard it said, “Then who can be saved?”

What they heard was that anyone that loves anything more than God cannot be saved. Sure the example in that story was the love of money but the young man was not willing to part with it in order to be saved.

The very first commandment made it painfully clear. We cannot make anything a little “g” god and place our love for that before loving God. We make idols that have no power to save us from ourselves.

John 15:13 Greater love has no one than this, that someone lay down his life for his friends.

That free will offering had to be God in order that the enormity of the task performed could make it possible to save anyone by faith.

This is why it is so important to believe that Jesus born of Mary is God incarnate.

John 14:15 “If you love me, you will keep my commandments.”

He earned the right to ask that of us by sacrificing Himself for us.