I'm not trying to make a comprehensive case that the world was better or worse before modernity, only that great advances come with great capacities for evil, and if there's one thing that the 20th Century has shown us it's that that evil will be unleashed. The Nazis were scientific about their genocide.
I can't speak for contemporary Christian interpretation, but your interpretation (of mankind's abilities if only we unify) falls pretty squarely within the Rabbinic tradition. I can't think of sources off the top of my head, but I have definitely heard that point made plenty of times .
The problem is that your approaching scripture with a very literalist approach (as is indeed the dominant mode of interpretation among Evangelical Protestants and New Atheists).
The story of the Tree is not an attempt at relating a historical event about some fellow named Adam. It's an allegorical commentary on the state of humanity (remember, Adam is simply Hebrew for "man" - his story is all of our stories). If you read the story closely, you see it's a commentary on the link between the intellect and sexuality (man's new intellect is manifested in shame at his nakedness, the snake was a common phallic symbol in antiquity, Adam's first copulation occurring right after the story, etc), the link between man's constant striving to take more than his share and his resultant angst (the ambitions of man require him to now live by the sweat of his brow, etc), and a moralistic lesson on the parallels between spiritual death (disobeying God) and physical death. All that wrapped up in a single simple narrative which even a child can grasp. If that's not profundity then I don't know what is.
We can talk for days about the different facets of the story and how they intersect with one another, and the beauty of it is that the whole thing is cloaked is such deceptively simple form.
You just have to read deeper and you'll see a tremendous amount of profundity behind the stories in the Bible. You don't need to be a believer to see that.
Just throwing g something up there, but the garden story could be just as simple as “ god gave them an order . They ignored it and were punished, and later peoples have added the various deeper meanings..
Not saying that I’m right, just that would likely be the easiest answer.
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