But if you say to me, “We trust in YHWH our God,” is it not he whose high places and altars Hezekiah has removed, saying to Judah and to Jerusalem, “You shall worship before this altar in Jerusalem”?
2 Kings 18:22

Hezekiah obeyed God by removing the high places where the people of Israel had set up forbidden shrines to YHWH and lesser deities. Rabshakeh made the same mistake all critics of YHWH's religion make: They try to understand it in terms of their own experience, but it doesn't fit any of those patterns. He's like Hollywood making documentaries about the "Real Jesus". They know neither "real" nor "Jesus".