@Perry
If you would like to start a new thread about the points you argue I would welcome that. In reply to the points you've already raised I can only point out again that your claim that Jewish theology agrees with your views on Original Sin is very incorrect.
Psalm 51.7 (in most Christian Bibles the verse count is different, and is usually numbered as verse “5”):
Indeed I was born with iniquity;
with sin my mother conceived me.
Note that this is a prayer of repentance made by David after committing adultery with Bathsheba and having her husband killed, leading to the eventual death of the child conceived by the adulterous act. This is therefore not a discussion about the sins of others or humanity’s guilt. David is discussing his own.
David doesn’t say, “I have inherited sin from Adam,” or even dares to say that someone else is responsible for his sin. David is saying his sin is his alone, not that it was passed from mother to son. Note that the Scripture doesn’t say all humans were born with iniquity or that all people have been conceived by their mothers with sin, just he himself.
Genesis 8.21
The devisings of humanity are evil from youth onward.
The text doesn’t say that people have inherited sin from Adam. It merely says that people have the capacity to plan or invent evil from their earliest ages.
The Bible also tells us that humans have the equal capacity to master this inclination at Genesis 4.7, and can choose good over evil as stated at Psalm 37.27.
You have argued that the word “youth” that appears in Hebrew implies that sin is inherited from infancy, but that is not true. The Hebrew word, “naur,” only means “youth” or “childhood.” “Naur” is not a noun describing a person but period of young age. In Hebrew it literally translates as “early life” and not as “young person.” A period of time or age cannot inherit anything.
Psalm 14.2-3
The Lord looks down from heaven
on humankind
to see if any are wise,
if any seek God.
All have gone astray,
depraved, every one;
there is no one who does any good;
no, not even one.
This text is very much read out of context. Note how in verses 4-6 ‘all who have gone astray’ are contrasted with a different group, “the generation of the just” of verse 5. The “all” who do no good, “no, not even one” are referred to as a group apart from Israel, referred to as “they.”
Are they [all who have gone astray] so witless,
all those evildoers,
who devour my people [a separate group from “all who have gone astray”]
as they devour food,
and do not invoke the Lord?
There they [all who have gone astray] will be seized with fright,
for God is present in the generation of the just [a separate group from “all who have gone astray”].
You may mock the plans of one that is poor,
but his refuge is the Lord.
No, this text is referring to the psalmists enemies as “all who have gone astray.” It does not include all human beings because it definitely does not include “my people” who are being devoured by the “all who have gone astray” group.
Job 15.15-16
If [God] doesn’t trust his holy ones and even the heavens aren’t pure in his eyes, how much less those who are abominable and corrupt, for they drink sin like water.
This text, which only half was quoted by you, is hyperbole. If it was literal, then Heaven, where G-d lives, is an impure place and all the angels live with the knowledge that G-d doesn’t trust any of them. Do you believe that too? These are not the words of faithful Job but of his “friend” Eliphaz the Temanite, and besides they merely state that G-d doesn’t trust people “who are abominable and corrupt.” It doesn’t say all humankind has inherited sin from Adam.
Jeremiah 17.19
This text does not “assume original sin.” It merely states:
Most cunning is the human heart, beyond remedy— who can truly understand it?
Ecclesiastes 9.3 is also hyperbole:
The hearts of all human beings are filled with evil, and madness is in the mind of every person throughout their lives, filling every moment until they die.
If this is literally saying that all human hearts are filled with evil, then it is equally true that all of us are suffering from madness until the day we die. But that is not what the text really means. Even if it were literal, it still doesn’t say humans inherited sin from Adam.