Bog Bodies

[Arjos]

Which is strange, considering the story of Abraham predates the development of modern western philosophy by several thousand years.

You've missed the point: the emphasis Kierkegaard saw on the human drammatic choice has a certain relevance for us...
For all we know in the past it was seen as human total devotion being rewarded...
Also other cultures can perceive it in a completely different manner...

At the same time, nothing precludes certain values to last for millennia...

Take, for instance, the innate value of human life. In times of extreme stress- famine, drought and war - these values can be eroded, but they persist mainly because no society can survive in their absence. They encourage the interaction and cooperation that are the hallmarks of an organised culture.

So this is innate and an hallmark of organised culture, because soon as said society is threatened it's immediately dropped? Thus having kept that moral in an abstract plain, has ensured that said society survives...
Yup, unbiased logic without any idealisation XD

Your very example shows how certain societies survived without it: interaction and cooperation do not equal the sanctity of life...