How were all men made sinners by the offense of Adam? Simple. If he would have remained in innocence then "law" would not have come into the world and sin is not imputed when there is no law:
Romans 5:12 does not say "conscience" or "law" entered into the world by one man or by one man's sin but rather SIN entered into the world by one man. However, your interpetation is based upon this reversal of the Biblical cause and effect. You would not only have conscience entering into the world by one man's sin (reversal of cause and effect) but the violation of conscience by many to be the cause of their own condemnation and death. If that were the case Paul could have easily said,
"
By one man's sin, conscience entered into the world and death by trangressing conscience, for all have sinned against conscience and therefore death by sin."
Adam is not charged with violating his conscience but with eating what was by Divine Law established in Genesis 2:16 as forbidden. Neither are his posterity condemned to death due to violation of their conscience but are condemned to death because of ONE MAN'S OFFENCE defined as violation of Genesis 2:16.
Nor does Romans 5:12-19 define the consequence (conscience) to be the cause of sin for many being made sinners, condemned or many being dead BUT rather the cause found in ONE MAN'S OFFENCE prior to the consequence of conscience established. Again, you reverse the Biblical order of cause and consequence and make the consequence (conscience) to be the cause of death and sin in many rather the consequence.
Romans 5:12-14 does not say that death reigned from Adam to Moses due to their own wilful violations of law of conscience , but rather death reigned over them in spite of the fact they did not sin after the similitude of Adam's transgression (willful sin - 1 Tim. 2:12). Hence, death is not attributed to their own individual willful sin but to the singular sin of Adam. Hence, death is not attributed to violation of conscience/law but Adam's singular violation of EATING the tree. Conscience was the consequence not the cause of sin etering into the world. You have made it the cause thus reversing the Biblical order of cause and effect.
Hence, when every man enters the world by birth they are already subject to death prior to any violation of their own conscience as the CONSEQENCE of ONE MAN'S OFFENCE, and if subject to death, they are already subject to condemnation prior to any personal violation of conscience, because death is the condemnation that finds its cause in "ONE MAN'S OFFENCE." The death of infants proves death is not the consequence of personal sin.
Romans 5:15-19 does not say that by
many offences many be dead, condemned, and made sinners but BY ONE MAN'S SINGULAR OFFENCE many be dead, condemned, judged and made sinners.
"...even as by one man sin entered into the world, and by sin death; and thus death passed upon all men, for that all have sinned: for until law sin was in the world; but sin is not put to account when there is no law" (Ro.5:12-13).
If you would have continued to quote verse 14 it would have exposed your explanation as false! Verse 14 proves it was not the WILLFUL SINS by many that is the cause of their death but rather the singular transgression of Adam that is the cause of death reigning between Adam and Moses.
14
Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam’s transgression, who is the figure of him that was to come.
How did "law" cme into the world by Adam that lead to all men being sinners? When Adam ate of the "tree of the knowledge of good and evil" he had the knowledge of the law written in his heart and his "conscience" bore witness to that law. His very nature had changed. The Lord said:
"Behold,the man is become as one of us, to know good and evil" (Gen.3:22).
Adam now had a "conscience" of the law written in his heart. All of Adam's descendants would thereafter be born in Adam's likeness and image, also having a "conscience", or an inborn knowledge of God's law:
God did not say when you violate conscience you will surely die but the precise law being violated is spelled out in Genesis 2:16 not Genesis 3:22. The former is the cause of sin (Gen. 2:16) while the latter is the consequence of sin. There are many consequences of sin (condemnation, death, future violation of conscience, booted from the garden, pain in child birth, etc.).
Adam's immediate and future offspring all were made subject to the CONSEQUENCES of his SINGULAR OFFENCE. But these CONSEQUENCES were not the CAUSE of their condemnation and death. They were born CONDEMNED ALREADY because infants die, and death is the condemnation brought into the world by ONE MAN'S SIN.
"And Adam lived an hundred and thirty years, and begat a son in his own likeness, and after his image; and called his name Seth" (Gen.5:3).
So Adam was responsible for death coming unto all men because he was responsible for bringing "law" unto all men. When all men after Adam sinned against the law written in their hearts they died spiritually--"and so death passed upon all men, for that all have sinned."
Adam was NOT responsible for bringing Law into the world as God brought the law into the world in Genesis 2:16. It is violation BY ONE MAN of the Genesis 2:16 law that brought sin and death into the world not the violation by many men of the Genesis 3:22 consequence!!!!!
The Calvinists cannot get anything right. They say that people are born dead in sin as a result of Adam's sin:
"They (Adam & Eve) being the root of mankind, the guilt of this sin was imputed, and the same death in sin and corrupted nature conveyed to all their posterity, descending from them by original generation" [emphasis added] (The Westminster Confession of Faith, Chapter VI., Number 3).
Paul says in no uncertain terms that "death passed upon all men, for that all have sinned."
A man is not dead spiritually as a result of Adam's sin but as a result of his own sins:
Paul did not say death came into the world by Adam bringing law into the world but by ONE MAN'S OFFENCE!!! Paul did not say "For all SHALL sin" but rather "all have sinned."
Death is not the condemnation of personal violation of conscience because INFANTS DIE! Thus they are CONDEMNED ALREADY even before they are born. "All have sinned" because all sinned when Adam sinned. The whole human nature was contained in ONE MAN and BY ONE MAN'S OFFENCE MANY WERE MADE SINNERS. All sinned when Adam sinned because all humanity was IN Adam and Adam represented ALL MEN when he sinned. Thus ALL MEN were condemned already PRIOR TO THEIR BIRTH and the proof is that INFANTS DIE and death is the CONDEMNATION for sin.
"And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses" (Col.2:13).
A person cannot die spiritually as a result of his own sin if he is born spiritually dead. That is because a person must first be alive spiritually before he can die spiritually.
Paul did not say, "And you, BECAUSE OF your sins are dead" but rather "BEING dead in your sins." They were dead in sin when before they were born and the proof is the condemnation of that sin which is death and infants die. However, as soon as they are sinners by nature they committ sins. Thus, "BEING dead in your sins."