There is no original sin or fall of man in Genesis. Its Gods moral teaching of man and the trial for mans freedom. God states the sin of one cant be extended to humanity as whole. There is no hell in Genesis. Hell was created as threat to force obedience. The meaning of Genesis is free will and morals and the free choice to come to God which Adam did accomplish. There was no sin
Genesis 3:23
The Lord God cast him out of the Garden of Eden; henceforth he was to labor tilling the soil from which he had come. When he expelled him, he placed cherubim to the east of the Garden of Eden with flaming swords to keep watch over the way to the tree of life.
When both Adam and Eve took the fruit of the Tree of Knowledge, they disobeyed God's instruction - becoming "Self Aware" of their nakedness - their "Spiritual Fall". And later, they were physically 'cast out' of the Garden of Eden - an Earthly paradise - and became subject to the physical world around them - enduring labor pains for Eve and physical labor for Adam. That is quite literally, "A Fall from Grace".
In terms of "extending it to humanity as a whole" it's automatic in the sense that humanity was no longer under "God's Grace" as in the days of the Garden of Eden. Humanity would need to balance out their physical world demands while attempting to regain God's grace - through Covenants, teachings of the Prophets and for Christians, through Jesus Christ and his teachings.
In the Books of the Old Testament - the concept of "Hell" is spoken of quite often - but in various ways.
Psalm 107:
They were lifted up to the heavens, then cast down to the depths;
their courage melted away in their plight.
Psalm 71:
Though you have made me see troubles,
many and bitter,
you will restore my life again;
from the depths of the earth
you will again bring me up.
Sheol is also mentioned many times - as a place a person goes to once they pass away.
God also speaks about "Forgiveness of Sins" in Hebrews 8:
I shall forgive them for their wicked deeds,
and I shall remember their sins no more.”
In regards of needing the concept of "Hell" to "force obedience" - that's an old conspiracy theory. God (quite literally) states over and over again the rewards for following his commands and Covenants and the punishments for not following his commands and Covenants - and the punishments stated in the Old Testament are the reason people use the term "Fear of God". There was no "additional concept of Hell" required for "obedience".
For many Christians, finding the Kingdom of God is an amazing reward and the concept of Hell is the idea of "losing something of great value that they once had" The idea alone will create "burning fire and brimstone" within their minds - the agony causing "the gnashing of their teeth". As you can see, the concept of Hell can be both physical and spiritual for many Christians.