Manasseh was twelve years old when he began to reign, and he reigned fifty-five years in Jerusalem. His mother’s name was Hephzibah. And he did what was evil in the sight of the Lord, according to the despicable practices of the nations whom the Lord drove out before the people of Israel. For he rebuilt the high places that Hezekiah his father had destroyed, and he erected altars for Baal and made an Asherah, as Ahab king of Israel had done, and worshiped all the host of heaven and served them. And he built altars in the house of the Lord, of which the Lord had said, “In Jerusalem will I put my name.” And he built altars for all the host of heaven in the two courts of the house of the Lord. And he burned his son as an offering and used fortune-telling and omens and dealt with mediums and with necromancers. He did much evil in the sight of the Lord, provoking him to anger. And the carved image of Asherah that he had made he set in the house of which the Lord said to David and to Solomon his son, “In this house, and in Jerusalem, which I have chosen out of all the tribes of Israel, I will put my name forever. And I will not cause the feet of Israel to wander anymore out of the land that I gave to their fathers, if only they will be careful to do according to all that I have commanded them, and according to all the Law that my servant Moses commanded them.” But they did not listen, and Manasseh led them astray to do more evil than the nations had done whom the Lord destroyed before the people of Israel. 2 Kings 21:1-9.
It is hard to say why Manasseh turned out so bad. His father was so devoted to the Lord, and he turned to God, who delivered him, when he was in trouble. But his son could hardly wait to abandon the faith, and do it so completely. It would only be after many years, when Manasseh was in trouble himself, that he would turn back to the God of his father. This is the hope of every parent who wonders where he went wrong.