the hebrew scriptures speak plenty of original sin
the opening book of the bible begins with mankinds fall into sin when Adam and Eve ate the from the tree forbidden to eat of.
And the later writers speak at length about the sins of the people and being 'born' sinners:
Psalms 51:*5*Look! With error I was brought forth with birth pains, And in sin my mother conceived me
First of all, there is no word in the Hebrew that parallels your "with birth pains".
Second, this verse is not saying that David was born a sinner. But that he was born
through sinning.
Job 14:*4*Who can produce someone clean out of someone unclean? There is not one.
You can't play around with the translation and then expect everyone to agree with you. It doesn't say "someone" by either clean or unclean. All this verse is doing is reiterating Eccl. 7:20: Everyone sins. That only means that everyone is born with an evil inclination, not that everyone is born in sin. That is Proverbs 24:16. Everyone makes mistakes. The righteous one is the one who fixes them.
Genesis 5:3 And Adam lived on for a hundred and thirty years. Then he became father to a son in his likeness, in his image, and called his name Seth
All of Adams offspring are 'unclean' and born in sin... this is why the Hebrew scriptures were looking for a Messiah to save them from this condition.
This is pure interpolation. The verse says nothing about being clean or unclean here. Adam was a man and he gave birth to other men. Not fish. Anything more than that is interpolation.
And if Judiasm doesnt teach such things today, its likely because they focus more on the teachings of the Mishnah then the Hebrew scriptures.
This is false.
-There is nothing that Judaism taught yesteryear that isn't taught today.
-The Mishnah is only a small part of the Talmud.
-The Talmud is replete with verses from Scriptures on every page.
-There is plenty of Jewish commentary on Scriptures. The smallest number of commentators I've seen in a "Rabbinical Bible" is six. Mine happens to have 14.
-Unless you can tell me that the average Christian is equally familiar with the "OT" as with the NT, this is not even a comment that you should be making.