Sin didn't come through mankind. It clearly teaches ONE MAN.
Romans 5 could not be written more plainly. Paul even names that one man whose transgression brought the sin in verse 14.
Romans 5:14 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.
The depths of brainwashing that exists in Catholicism that keeps one from being able to read and understand the clear meaning of simply everyday words to communicate something is staggering.
Satan is still getting mileage out of that line of "Did God really say..... "?
The proof to the contrary is that there is not complete unanimity on interpretation and without an authority other that what it means to the individual your interpretation is no more valid than mine or Pol Pots.
"Now I exhort you, brethren, by the name of our Lord Jesus Christ, that you all agree and that there be no divisions among you, but that you be made complete in the same mind and in the same judgment." - 1 Corinthians 1:10
Should we take a vote?