Paul had begun using Adam as a comparison and contrast to Messiah Yeshua. His points so far have been:
1. Through one man (Adam) sin and death entered the world.
2. Man has inherited death as a consequence of Adam's sin.
3. Man does not inherit the guilt or accountability of Adam's sin.
4. While Adam brought sin and death, Yeshua brings the cure.
Romans 5:15-17 (KJV)
But not as the offence, so also is the free gift. For if through the offence of one many be dead, much more the grace of God, and the gift by grace, which is by one man, Jesus Christ, hath abounded unto many.
And not as it was by one that sinned, so is the gift: for the judgment was by one to condemnation, but the free gift is of many offences unto justification.
For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.)
This section of Scripture is still a part of the parenthetical comment Paul was making, in explaining how death came upon the human race through Adam.
In verse 15 Paul stated that there was a contrast between Adam's sin (the offence) and Yeshua's gift of righteousness. For if through the sin of Adam many die, how much more, through the death and resurrection of Yeshua, the gift of righteousness abounds unto many? The grace given would far outweigh the sentence of death.
Paul further stated that Adam's sin led to condemnation whereas Yeshua's gift of righteousness leads to justification (verse 16). Nor does Yeshua's gift cover only Adam's sin, but all the sins of the entire world.
Finally, in verse 17, Paul contrasted the reign of death that Adam's sin brought to man, to those who by abundance of grace and the gift of righteousness, brought by Yeshua, shall reign in life. Not only did Yeshua defeat death, but He brings abundant life to those who believe in Him.
Although there are similarities between Yeshua and Adam, the work of Yeshua far exceeds Adam's!