Let's first deal with Romans 5:12-14. "Therefore, just as sin came into the world through one man, and death through sin, and so death spread to all men because all sinned-- for sin indeed was in the world before the law was given, but sin is not counted where there is no law. Yet death reigned from Adam to Moses, even over those whose sinning was not like the transgression of Adam, who was a type of the one who was to come. "
There is absolutely nothing in those verses that says or even suggests that the trespass of Adam is imputed to us -- NOTHING!
Yes. . .and no.
Imputation of Adam's sin:
1) is according to not
inheriting our ancestor's sin (
Eze 18:20),
2) is the logical
conclusion of the "contradictory" argument Paul has set up in
Ro 5:12-14; i.e., between Adam and Moses "all sinned," and "no one sinned,"
3) is the
meaning of the contrasting parallels of
Ro 5:18-19 (which positions of first and second statements
in the following contrasting parallels I have reversed for the sake of clarity):
so also. . .the result of one act of righteousness was
justification that brings life for all men,
Just as. . .the result of one
trespass was condemnation for all men. (
Ro 5:18)
How did
Christ's righteousness
bring life to us?. . .By
imputation,(
Ro 4:1-11,
Ge 15:6)
just as Adam's trespass brought
condemnation for all men (by
imputation).
so also. . .through the obedience of the one man the many will be
made righteous,
Just as. . .through the disobedience of the one man the many were
made sinners. (
Ro 5:19)
How did
Christ's obedience
make us righteous? By
imputation (
Ro 4:11,
Ge 15:6),
just as Adam's disobedience made us sinners (by
imputation).
AND which imputation of Adam's sin was the pattern for Christ's (Ro 5:14) righteousness imputed to us.
So. . .the many were
made righteous by Christ's righteousness (
Ro 4:1-11, Ge 15:6), which was also
the
pattern (
Ro 5:14) for the many being
made sinners (
Ro 5:12) by Adam's sin, and they were made
both righteous and
sinners by
imputation.
We can get into an indepth discussion of that passage if you like, but again, there is nothing about imputing the sin of Adam to anyone. In short, given the discussion already presented by Paul concerning those who have not been given the law (of Moses), we know that sin existed with or without the law., i.e., "They show that the work of the law is written on their hearts, while their conscience also bears witness, and their conflicting thoughts accuse or even excuse them" (Rom 2:15). And the just punishment for such sin is death (spiritual, not physical). Thus there is no need to interject any notion of imputation of Adam's sin to any who had not received the law of Moses.
Moving on to Romans 5:18, the text says, "Therefore, as one trespass led to condemnation for all men, so one act of righteousness leads to justification and life for all men."
First understand that that verse, as with that entire passage, is dealing only with the difference between the results of Adam's trespass to all men and the results of Jesus' righteousness to all men. It is NOT dealing the results of the trespasses and sins of all men; Paul deals with those sins immediately following, beginning with 5:20 and continuing on into chapter 6.
You spoke of the pattern set by verse 14. If indeed you wish to stay with that, then the pattern set by the first phrase of verse 18 (and verse 19) is the condition of all men when they are born into this world. Staying with that pattern then the second phrase is the condition of all men when they are born into this world.
The issue of the condition of all men at birth is: condition by
inheritance through birth, or condition by
imputation from God at birth.
The first phrase says Original Sin; the second phrase says Original Grace. It says that whatever you think the effect of Adam's sin was upon the whole of mankind, the effect of Jesus' righteousness upon the whole of mankind was to negate the effect of Adam's sin. It says that we come into this world with spirits formed in each of us (Zech 12:1; Eccl 12:7) by God that are alive and well. The spirit of each becomes dead in the trespasses and sins of each.
They say neither, for neither "Original Sin" nor "Original Grace" is stated in Scripture.
Ro 5:12-14 demonstrates that even when mankind between Adam and Moses
did not sin (
Ro 5:14) because there was no command to transgress and to cause death (
Ro 5:13,
4:15) as there was with Adam (
Ge 2:17), all mankind died anyway, because of of the
guilt of
sin (
Ro 5:12).
What sin?
No one sinned (
Ro 5:14).
God
imputed Adam's guilt to all those born of Adam, which was the
pattern (
Ro 5:14) of Christ's righteousness being
imputed (
Ro 4:1-11) to all those born of Christ (
Ro 5:18-19), just as righteousness was
imputed to Abraham (
Ge 15:6).