John 3:3 Jesus answered him, “Truly, truly, I say to you, unless one is born again he cannot see the kingdom of God.”
Nicodemus was confused and I don’t blame Him.
John 3:8 The wind blows where it wishes, and you hear its sound, but you do not know where it comes from or where it goes. So it is with everyone who is born of the Spirit.
Jesus told Old Nic what had to happen but did not explain how it would happen.
Jesus explains, “And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, that whoever believes in him may have eternal life.”
This probably confused Nicodemus more than ever. The serpent represents Satan, sin incarnate, how could the Son of Man become a serpent on a cross? Even if He could, how did that lead to eternal life? Obviously having just one or two pieces of the puzzle does not complete the picture needed to see what has to be done. At his point if Nicodemus were to believe Jesus, he would not be saved. What else is required to be saved?
Let us deal with the issue of the Son of Man becoming sin.
Deuteronomy 21:23 his body shall not remain all night on the tree, but you shall bury him the same day, for a hanged man is cursed by God. You shall not defile your land that the Lord your God is giving you for an inheritance.
Since God’s Word is true and the Son was hung on a tree He became cursed by God. He became the representative of sin, the serpent on the cross.
Galatians 3:13 Christ redeemed us from the curse of the law by becoming a curse for us—for it is written, “Cursed is everyone who is hanged on a tree.”
The curse of the law is death and in order to redeem us from that curse He would have to demonstrate His power over death.
John 10:17 For this reason the Father loves me, because I lay down my life that I may take it up again.
Why was it important that Jesus laid down His life?
Psalm 54:6 With a freewill offering I will sacrifice to you; I will give thanks to your name, O Lord, for it is good.