Whether it happened or not was never the focus except for critics.
What was always important was that it was used as an extreme example of obedience – an unthinkable scenario.
It’s even more vivid in the case of Job.
If you go through the teaching and theological texts through the history of the religions, this story was always used as an example with which to debate and discuss and compare to one’s own life.
Could you do it?
Would you do it?
Whether it happened or not wasn’t questioned because it didn’t matter. What mattered was the lesson it gives. A thought experiment.
Then again, I find nearly all thought experiments ridiculous beyond a certain point: How many people use examples from movies (like the Matrix) to base their real lives on?
But that’s my bias.