What does Isaiah 57:6 teach about idolatry?

In Isaiah 57:6, the Lord confronts His people regarding their idolatrous practices, indicating that what they considered their inheritance, the smooth stones of the stream, represents their false worship. This passage reveals that God will give people what they desire, which in the case of idolaters, is death instead of life. The people worshipped not only without true understanding but also with a misplaced zeal for religion, which God finds abominable when detached from a heart that seeks Him. This illustrates the futility of relying on rituals and human-made entities for salvation instead of the living God. True worship must reflect a heart transformed by grace.