Sennacharib could not understand the mind of Hezekiah. As king, he could not see the strategy behind Hezekiah ordering the destruction of all of the other gods and closing all the altars except those in the temple at Jerusalem. Sennacharib thought that surely more is better. Why do these people of Judah trust in only one puny God?
He learned his lesson, that one puny God sent one puny angel and killed all his mighty warriors without a battle. He limped home in shame and was killed while worshipping his god. When you are praying to the right God, there only has to be one.
LORD, we trust in you alone.
2 Chronicles 32