The old ways of human sacrifice demanded by Gaia and Chronos were retired by Zeus and animals took their place. Mainly this was done so the sacrificial animal could be the main dish for the honored guests of a party, and work around the fact that Greeks get sick when digesting human flesh. Christ kept this tradition, but further reduced it by the communion of drinking wine instead of animal sacrifice. Honestly this last step removes too much from the old tradition, as hosting a feast at every religious gathering was far easier when you could eat the sacrificial animal. The fun part is the sacrifice was mostly the ideal way to butcher the animal and how to spread this knowledge around easily. So human sacrifice does not make much sense unless the jews lack the trait of getting sick when digesting human flesh. And because this is a core defining trait of being human, any "near human" who lacks this trait isn't human.