It's obviously true that morality is relative. But it's just as plausible to suggest that some universal values constrain human actions. 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.
Which is strange, considering the story of Abraham predates the development of modern western philosophy by several thousand years.Abraham's story as you've put it, or Kierkegaard really, has validity for the modern values in western society...
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