When I was a kid I remember telling my grandfather how cruel I thought it was that God would tell Abraham to murder his own son. The response I got was, "When God tells you to do it, it's not murder. And besides, God must have known that it would be written about and used for generations to help mankind be obedient to God."
He wen't on, "And remember, God does not test us with evel things." (James 1:13)
I concluded early on that telling a man to kill his children is not evil.