God commands child sacrifice (not Isaac story)

[Godscreated]

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(8:18 pm. PST) edit: This is not about the story of the sacrifice of Isaac!

You almost never hear this but God in the OT actually explicitly commanded child sacrifice and then later changed his mind.

The command from God for child sacrifice. Exodus 22:29-30,
God later changed his mind. Ezekiel 20:25-26

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I remember reading these passages in an Old Testament class back in Bible College. I was perplexed, then horrified as an 18yr old kid thinking that I could not believe in a never-changing, consistent god. As a PK (preacher's kid) growing up in the Christian faith, I was very aware of what it says in the Book of Malachi 3:6: "I am the Lord, and I do not change".

The Professor was a bit liberal with Biblical interpretation and agreed, god did change. So what does this really say about the Good Book? There's really no other way to interpret this. The Bible contradicts itself - over and over again. And I find it so amazing that highly intelligent people give these contradictions a pass, all in the name of "God's Mysterious Ways".

The professor changed not God, why would a mere mortal be able to determine what God is or is not.