There is Moses, sacrificing animals and pouring their blood on his alter. He did this while advising others, “do not suffer witches to live” (Exodus 22:18). That is the autocratic warlord who threatened his subjects with expulsion if they did not practice partial child sacrifice. But circumcision is witchcraft, and Moses is dead. And his henchmen are dead. No one will kick you out of anything if you do not torture your own child.
Why would so many people be taken in by such archaic cretinism, to the point of over-riding their own intuition. “Do not take for doctrine the commandments of men” is what Jesus advised. And Ted Kaczynski in the exact same vein notes that “oversocialization is among the more serious cruelties that human beings inflict on one another.”