Jesus, the Son of God, came to earth and became the Son of Man. He was both man and God. He became God’s Lamb so that He could become God’s Shepherd. This is both beautiful and profound.
God put Himself sinlessly into our fallen state so that He may righteously redeem and justify a new kingdom of mankind. Adam is the head of our natural temporal state and we are all born into sin through him. When we enter into 2 Corinthians 5:17 as a believer, we are born a second time into the second Adam, Jesus Christ, 1 Corinthians 15:45. The first birth is a natural birth and the second birth is a spiritual birth, 1 Corinthians 15:42ff, “the last Adam became a life-giving spirit.”
We are spiritually dead in Adam. We are spiritually alive in Christ. In
Adam we are naturally hostile to God and we shun spiritual things. Yet, while in Adam and hostile to God, Christ died for us and reconciled us back to God.
This is the argument Paul makes in 1 Corinthians 15 and in Romans 5 but notice this astounding announcement in verse 10 of Romans 5: