My understanding of the word 'original ' would mean: first.
The first sin I find in Scripture was a lie told by Satan at Genesis 3:4 that Adam and Eve would Not die.
So, original sin for Satan was that he became the father ( or life giver ) to the lie - John 8:44.
Original or first sin for Adam and Eve was the crime of breaking God's 'law of the land' to Not eat from God's tree.
So, I don't understand how ' original ' or ' first ' sin is Not a Bible teaching because there was No sin here on Earth before Satan and Adam and Eve sinned. They started sin by being the first to originate sin. Adam and Eve by breaking God's do-not-touch from the forbidden tree law.
The original sin was God lying to Adam that he would die in/on the day he ate the fruit.
According to genesis 2:16 God told Adam not to eat from the tree of knowledge of good and evil for when he ate it he would die.
The talking serpent corrects Eve understanding about the poisonous tree of knowledge.
Genesis 3:Now the serpent was more crafty than any of the wild animals the Lord God had made. He said to the woman, "Did God really say, "You must not eat from any tree in the garden"?"
2 The woman said to the serpent, "We may eat fruit from the trees in the garden, 3 but God did say, "You must not eat fruit from the tree that is in the middle of the garden, and you must not touch it, or you will die.""
4 "You will not certainly die," the serpent said to the woman. 5 "For God knows that when you eat from it your eyes will be opened, and you will be like God, knowing good and evil."
Now we have two opposing choices Eve is faced with (Eve's dilemma). Who spoke the truth God or the serpent?
1. Eat the fobidden fruit and you will die according to God to Adam.
2. Eat from it and their eyes will be opened and they will be like God knowing good and evil according to the serpent to,Eve.
Eve ate the forbidden fruit and gave some to Adam.
1. The first thing they noticed was their eyes were opened exactly as the serpent told Eve.
Genesis 3:7 Then the eyes of both of them were opened, and they realized they were naked; so they sewed fig leaves together and made coverings for themselves.
2. They did not die after eating the forbidden fruit. So God was lying.
Genesis 3:Then the man and his wife heard the sound of the Lord God as he was walking in the garden in the cool of the day, and they hid from the Lord God among the trees of the garden. 9 But the Lord God called to the man, "Where are you?"
10 He answered, "I heard you in the garden, and I was afraid because I was naked; so I hid."
11 And he said, "Who told you that you were naked? Have you eaten from the tree that I commanded you not to eat from?"
3. God confirms in scriptures he was lying because he offers the same explanation as the serpent offered to Eve :" Eat from it and your eyes will be opened and you will be like God knowing good and evil."
Genesis 3:22 And the Lord God said, "The man has now become like one of us, knowing good and evil. He must not be allowed to reach out his hand and take also from the tree of life and eat, and live forever."
God goes a step further and stops Adam and Eve from reaching out to take also from the tree of life and eat, and live forever."
So not only were Adam send Eve created as mortals. They were now denied access to the tree of life which would have allowed them to live forever. They certainly did not die as God had warned, in fact he said they would continue to live and work which totally contradicted his warning that they would die if they ate the firbidden fruit.
Genesis 3: 23 So the Lord God banished him from the Garden of Eden to work the ground from which he had been taken. 24 After he drove the man out, he placed on the east side[e] of the Garden of Eden cherubim and a flaming sword flashing back and forth to guard the way to the tree of life.
So we know death did not come into the world because Adam and Eve ate from the tree of knowledge of good and evil. Death come into the world when God killed the first animals to make garments of skin for Adam and Eve and because he denied access to Adam and Eve the tree of life which would have allowed them to live forever.
Die definition, to cease to live; undergo the complete and permanent cessation of all vital physiological functions; become dead.
Adam and Eve did not die (to cease to live; undergo the complete and permanent cessation of all vital physiological functions; become dead).after eating the forbidden fruit.
Adam and Eve continued to worship and thank the lord for their children. They even taught theur children to make offerings to a God. And God continued to communicate with Adam and Eve and their family.