Westminster Q22: Did all mankind fall in that first transgression?

(Act 17:26) and He made from one man every nation of mankind to live on all the face of the earth, having determined their appointed times and the boundaries of their habitation,
(Gen 2:16-17) The LORD God commanded the man, saying, "From any tree of the garden you may eat freely; but from the tree of the knowledge of good and evil you shall not eat, for in the day that you eat from it you will surely die."

(Rom 5:12-20) Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned-- for until the Law sin was in the world, but sin is not imputed when there is no law.

Nevertheless death reigned from Adam until Moses, even over those who had not sinned in the likeness of the offense of Adam, who is a type of Him who was to come.

But the free gift is not like the transgression. For if by the transgression of the one the many died, much more did the grace of God and the gift by the grace of the one Man, Jesus Christ, abound to the many.

The gift is not like that which came through the one who sinned; for on the one hand the judgment arose from one transgression resulting in condemnation, but on the other hand the free gift arose from many transgressions resulting in justification.

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.

For as through the one man's disobedience the many were made sinners, even so through the obedience of the One the many will be made righteous.

The Law came in so that the transgression would increase; but where sin increased, grace abounded all the more,

(1Co 15:21-22) For since by a man came death, by a man also came the resurrection of the dead. For as in Adam all die, so also in Christ all will be made alive.