Do you believe that everyone they're commanded to kill deserves it in your moral framework? If not, that's a divergence in beliefs. Once again, in their eyes this is an objectively moral command from God.
Human sacrifice was wrong in *your* moral framework, not theirs. If you had been raised in their culture at the time you would have participated because it was normal.
We can slice this different ways. Some vegans believe it is immoral to eat meat and should be illegal. I eat meat. If it becomes illegal to eat meat, I'm not going to apologise for past meat consumption even if the punishment for future meat consumption is severe
