"And she will bring forth a Son, and you shall call His name JESUS, for He will save His people from their sins." --Mt. 1:21 NKJV
The first step in redemption was Christ's identification with our humanity. This took place in His Incarnation. Christ was made flesh (John 1:14). Hebrews 2:14 says, "Inasmuch then as the children have partaken of flesh and blood, He Himself likewise shared in the same...."
But at the time of His Incarnation, Jesus did not partake of the nature that reined in the spirit of man. Had He done so, then He would have been spiritually dead during His earthly ministry! Then He would not have been able to please the Father, He would have done His own will. No, His identification with the spirit nature of man didn't take place until the cross.
At the cross God actually made Jesus to become sin for us (2 Cor. 5:21). Our sin nature itself was laid upon Jesus until He became all that spiritual death had made man. In the mind of God, it was not Jesus Christ who hung on the cross; it was the human race who hung there. Therefore, each us may say with Paul, "I was crucified with Christ."
Confession: Because Jesus came to save me from my sins, I can claim Galations 2:20, which says: "I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me."