2 Kings 17:33 “They feared the LORD, and served their own gods, after the manner of the nations whom they carried away from thence.”
The mixed group of people whom the kings of Assyria had placed in Israel (Samaria) "feared" the Lord but "served" the gods of their ancestors or the gods of the nations they had come out of. At some level acknowledgement was made to the Lord God but in their hearts they continued to live for their old gods. Matthew Henry observes they "worshipped the God of Israel for fear and their own idols for love." Treasury of Scripture Knowledge observes "it is said that the Israelites 'did not fear the Lord,' yet the heathens, who followed their example, are said 'to have feared the Lord'." During revival we discovered that often religious people will reject what sinners will accept as truth.