Solomon worshiped the Sidonian goddess Astarte and the detestable Ammonite god Milcom.

I am taking the kingdom from him because they have abandoned me and worshiped the Sidonian goddess Astarte, the Moabite god Chemosh, and the Ammonite god Milcom. They have not followed my instructions by doing what I approve and obeying my rules and regulations, like Solomon's father David did.

The king ruined the high places east of Jerusalem, south of the Mount of Destruction, that King Solomon of Israel had built for the detestable Sidonian goddess Astarte, the detestable Moabite god Chemosh, and the horrible Ammonite god Milcom.