Albert Barnes Commentary 2 Kings 3:2

"And he did that which was evil in the sight of Jehovah, but not like his father, and like his mother; for he put away the pillar of Baal that his father had made." — 2 Kings 3:2 (ASV)

On the “evil” done by Ahab, see especially 1 Kings 16:30–34. Warned by the fate of his brother (see the note on 2 Kings 1:4), Jehoram began his reign by formally abolishing the Phoenician state religion introduced by Ahab—even while tolerating its continuation among the people (2 Kings 10:26–27)—and by re-establishing the old form of worship for the kingdom as arranged by Jeroboam.