The first Adam last Adam analogy is found in 1 Corinthians 15, and serves to wonderfully depict the glory and superiority of the New Covenant over the Old.
Through the sin of one man (first Adam), death came into the world. This resulted in that when a human being is born, they are born into this inherent sinful state (with a sinful nature). Without asking for it, sin is automatically imparted to us at birth because of first Adam’s sin. Thus when we are born, we are born into first Adam. But when we come into Christ (last Adam), simply by putting our faith in Him, His righteousness is automatically imputed to us. And because He also obeyed ALL the laws on our behalf, God’s blessings and life and abundance are also automatically given to us as a free gift, not because we try to earn or deserve it. Thus when we are born again, we are born into last Adam.
Rom 5:17 For if by the one man’s offense death reigned through the one (first Adam), much more those who receive abundance of grace and of the gift of righteousness will reign in life through the One, Jesus Christ (last Adam). 18 Therefore, as through one man’s offense judgment came to all men, resulting in condemnation, even so through one Man’s righteous act the free gift came to all men, resulting in justification of life. 19 For as by one man’s disobedience many were made sinners, so also by one Man’s obedience many will be made righteous. (NKJV, annotations added)
No amount of holy living or law keeping could move us out of our fallen state in first Adam. We were stuck there, and the only way to be saved was to put our faith in Jesus Christ (Rom 10:9-10). Likewise, the moment we come into last Adam (Jesus Christ), no amount of sin or “unholy” living can move us out of this position of perfect righteousness. Although most Christians believe the first part to be true, they have a problem with the last part. This is because we have a wrong idea of our Father. We forget that when He looks at us, He sees Jesus. He sees the perfect obedience of His beloved Son. We were made righteous! The first Adam last Adam comparison makes it perfectly clear that what was lost in Adam, was restored in Christ!
God does not count ANY of our sins (past, present or future) against us. He is not surprised when we sin. He is not shocked by the ungodliness going on in the world today. God is perfectly content, at rest, at peace, all the time enveloped in the amazing love of the Trinity (imagine the amazing love between the Father, Son and Holy Spirit!). God is secure in Himself, secure in His bride and secure in you, His child. He does not count your sin against you – He already broke His rod of punishment on the back of Jesus. Now if God justified us completely when we first believed in Jesus, why then do we still try to justify ourselves by working so hard to gain God’s acceptance?
Rom 4:5 But to him who does not work but believes on Him who justifies the ungodly, his faith is accounted for righteousness, 6 just as David also describes the blessedness of the man to whom God imputes righteousness apart from works: 7 “Blessed are those whose lawless deeds are forgiven, And whose sins are covered; 8 Blessed is the man to whom the LORD shall not impute sin.” (NKJV)
Our sin was imputed (accounted) to Jesus, so let’s rest in our Father’s love, knowing that God will never count our sins (past present and future) against us anymore!!