[ajuc]

> Under this belief system, it might be okay to enslave or even kill humans

This is actually what most christians believe (see Abraham's sacrifice). God is the ultimate source of morality, so if God wants you to kill your son - it's the morally good thing to do.

Which shows nicely that morality does not, in fact, come from God or Bible (if it did - we wouldn't care about Isaac - we'd consider it good that he'll get killed by his father). Instead we can't help but feel it's wrong to kill your son.

It's the conflict of the actual "natural law" vs the artificial religious "natural law" nicely wrapped up in one short story.