The Judicial Effect.

With the fall of Adam and Eve we had a new circumstance in creation that was not and could not have been present with the angels. Adam and Eve could have children, angels could not. (Matthew 22:30 “For in the resurrection they neither marry nor are given in marriage, but are like angels in heaven.”) When Satan and his angels fell they fell as individuals. When Adam fell he fell for the entire human race. Romans 5:17-18 “For if by the transgression of the one, death reigned through the one, much more those who receive the abundance of grace and of the gift of righteousness will reign in life through the One, Jesus Christ. So then as through one transgression there resulted condemnation to all men, even so through one act of righteousness there resulted justification of life to all men.” When Adam and Eve had children, it was after the fall, and they passed on their sin nature to those children. Genesis 5:3 “When Adam had lived one hundred and thirty years; he became the father of a son in his own likeness, according to his image, and named him Seth. Was this the original image of Adam before the fall or was it the image after the fall? It was the fallen image that is passed on through the father to the children. Compare Psalms 51:5 with Ephesians 2:3. In Psalms we read “Behold, I was brought forth in iniquity, And in sin my mother conceived me.” This is David speaking of having sin from birth. In Ephesians we read “and were by nature children of wrath” not by action but by nature we were children of wrath. It is because of this nature being passed on from father to child that Christ could not have a human father. If Christ had a human father then He would have had a sin nature. If He had a sin nature then His sacrifice would not have been acceptable to God. If His sacrifice was not acceptable to God then we are not saved.
Why is all of that important? Because of Romans 5:18 “So then as through one transgression there resulted condemnation to all men, even so through one act of righteousness there resulted justification of life to all men.” Because all mankind was condemned in Adam, Christ could redeem all mankind through one sacrifice.