And there's no murder between religious enemies, because God told them to do it. Kill your son? Well, maybe God said so, so it's not wrong. Kill your neighbor? Maybe God told you to kill him because he's a nonbeliever.
Religion gives you all the cover you need to do any sort of immoral act.
I don't believe would say kill your son . God speared Isak from Abraham would sacrifice him . Beside that was one thing that Israelites acquired such customs from the Canaanites and others to sacrifice their children to moloch .