How Adam’s sin imputes to all men isn’t so clearly explained in Scripture. This is probably more a translation issue than some reason on God’s part not to reveal it to us. Adam’s disobedience brought death upon all but nowhere is it said to be the reason we disobey! The idea of a fallen human nature might be true but it is only thought to be in our explanations and not the Biblical text. [The New Living Translation of the New Testament uses the phrase “sinful nature” 27 times only in Paul’s Epistles referring to “the flesh.”]
A key verse to know is Romans 5:12, “Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that [because] all have sinned.” Saint Augustine read this verse in an Old Latin translation; The final phrase “for that all have sinned” he understood to mean, “in whom [Adam] all sinned.” This is not the well-accepted translation of the Greek word, “for.” If we fault Adam for anything it is that, as Francis Godet wrote, “he laid human life open to the power of sin.” By “sin” we mean the revolt of all mankind against God. Some see Adam as our representative or proxy in Eden; so, when he sinned, he did it on our account. We only know that God decided that there was only one way to save Adam and all mankind—through Christ. The first Adam introduced us to evil; the Last Adam defeated and removed it. Paul’s message is grace.
A Few Things We Do Know
(1) Because of Adam’s disobedience, God would forbear any punishment until Christ came [Romans 3:25-26]. Meanwhile mankind is denied access to the Tree of Life [Genesis 3:22, 24].
(2) As Paul said in 2 other verses, Romans 11:32 and Galatians 3:22, “God has concluded [imprisoned: held] everyone in unbelief, that He might have mercy upon all and that the promise by faith of Jesus Christ might be given to us who believe. The word, “concluded” means to hold in prison. This is good news! God was saying that aside from His mercy and Faith in Christ, there is no pathway back to Eden and to Him—there is no salvation and no freedom from the bondage to sin. God passed judgment on mankind, not to punish but to show mercy (grace). Scripture is saying that when Adam was escorted out of Eden, God knew that He would be required [Matthew 26:39] to send His Son to Calvary before mankind would have another opportunity to eat of the Tree of Life [Revelation 22:14].
Romans 5:19 tells us, “as by one man’s disobedience many were deemed [made] sinners, so by the obedience of one shall many be deemed [made] righteous” “Made” is the wrong word. The Greek means more at “appointed” or “declared.” Most Protestants have no problem translating the second clause this way: ” by the obedience of one [Christ] shall many be deemed [declared] righteous.”This supports God’s decision to “conclude all in unbelief.”
(3) Thirdly, Paul called us all sinners. This word used for sinning, meaning to “miss the target,” is defined in Romans 3:23 as “coming up short of the Glory of God [the target]. It was for His glory and to glorify Him we were created and now we missed that highest of callings [Psalm 86:9, 12; Matthew 5:16; 1 Corinthians 6:20].
Whatever happened with Adam, God saw it as an evil touching all mankind. One commentary says, “When Adam sinned, the human race sinned, because the human race was in Adam.” Augustine then declared “The entire human race that was to pass through woman into offspring was contained in the first man… and humanity produced what humanity became….” [Augustine, “On the City of God” 13,3].
The Fall of Adam
In Romans 5:15 [NET] we read “…if the many died through the transgression of the one man, how much more did … the gift by the grace of the one man Jesus Christ multiply to the many!” (1) The word “transgression” here comes from a Greek word meaning “to deviate from or wander off the path.” It is probably here that Saint Augustine coined the terms “The Fall” and “original sin.” (2) Paul seemed to be saying: If we all died through Adam”s disobedience [and we did!] now Jesus’ death can provide by faith the eternal life we lost when Adam was driven out of Eden [1 Corinthians 15:21]. What Adam broke, Jesus fixed.
Justification Through Christ
Paul, finally, argues in Romans 5:16 “for the judgment was [caused] by one [Adam] to condemnation, but the free gift [through Jesus’ death] is of many offenses unto justification.” Perhaps, we should not leave unnoticed that in Romans 5:15 Paul’s attention was on the sin, whereas in verse 16, it was on the sinner, who was ultimately God’s interest. God’s move to expel Adam and Eve from Eden was not an act of punishment, as if, all God could think about was their disobedience. His thoughts were on the sinner—on us. God evicted Adam and Eve as an act of mercy anticipating the day when Christ would die and rise again to provide for our justification [Romans 4:25].