Babylonians, Romans, Greeks, Carthaginians and Canaanites all performed blood sacrifices. Druids were also recorded as having blood sacrifices. Hindus also perform blood sacrifice, human sacrifice to Kali. I'm probably missing a lot more, like Aztecs and so on. Your entire worldview is a false caricature. Instead of "Liberal Atheism/ Communism = Good, Religion = bad" it is "Pagans = good, 'Abrahamic' = bad." Human sacrifice is something the Israelites practiced, yes, and it's addressed in the bible as being "Baal worship." The purpose of animal sacrifices- which, if you are a vegan, you may feel overly emotional towards, is not for the same purpose that animals were sacrificed to Baal. The reason why there was no longer any sacrifices needed after the new covenant/ Crucifixion of Christ, was not because of a blood sacrifice debt being payed, but because having to sacrifice your prized livestock was a reminder of loss, a loss that pales in comparison to the loss that would have to be endured by God, should his promise to Israel be fulfilled.