I am saying that there is still much to be learned about the develpment of those civilizations and why they crumbled. What we do know is has been uncovered fairly recently.
People were willing to give up their loved ones out of fear of angering not only the gods but those in control, including the priests. Some were so indoctrinated in religious lore that they were willing to be sarcificed, but that only happened to the loosing team.
As to the God of the Bible who abhorred human sacrifice. One of His rules or laws was to love your enemy. As to where God is now, He is patiently waiting for men to come to the edge of extinction before He steps in and takes personal control.