The Tanach is chock full of references to human sacrifices. Moses himself was a human sacrificer.<quoted text>
Also address the matter of the religion that they were following when they worshipped idols even AFTER the time of Moses and which included the sacrifice of their children.
I don't understand your opposition to idols that're are human attempts to remember the ideal in concrete form - in the orthodox view, it's ok to worship an unseen G-d with human qualities but it is not ok to make an idol of the same anthropopathic G-d for worship. The unseen G-d with human traits is faceless, the other version which is the idol has a face/form. The qualities remain unaltered in both aspects - so, where lies the difference?