What descendant of Adam is not guilty of sin?
Adam was given the responsibility to choose to respond to God's natural law and obey God's formal commands. Adam failed on both counts, freely.
Since then, all of Adam's seed has been held in bondage to the falsehoods of Satan that Adam chose to heed, instead of heeding the word, will, and holy commands of God.
Since then, there has been no spiritual freedom existent in the nature of man to choose to serve God or do what is morally right. Man is totally corrupted by sin and only inclined to do what is evil.
Only the grace of God and the imputation of Christ's righteousness, can free the will of sinners, to serve righteousness as they should.
I disagree. Man was created morally accountable to live according to the laws of God, and even though Adam failed and cast all mankind into bondage to sin, death, and the devil . . . the laws have not changed and man is still held accountable . . . for what he is not unable to perform
That is why God sent His Son as Savior, to do for fallen men, what they should but never would be able to do for themselves.
Your scenario is faulty. All men inherited the sin nature of Adam, and all men are sinners. None are righteous or able or willing to serve God. (Romans 3:10-19) All men are imputed with the guilt of Adam, for he was federal head of the entire human race.
Only by the grace of the federal head of all redeemed men, Jesus Christ, are the sons of God imputed with His righteousness and justified in the sight of God.