2 Kings 17:8, 12, 34

They had followed the practices of the pagan nations the LORD had driven from the land ahead of them, as well as the practices the kings of Israel had introduced.

Yes, they worshiped idols, despite the LORD’s specific and repeated warnings.

And this is still going on today. They continue to follow their former practices instead of truly worshiping the LORD and obeying the decrees, regulations, instructions, and commands he gave the descendants of Jacob, whose name he changed to Israel.