Deuteronomy 16 ends with the command to never set up Asherah poles or sacred pillars beside the altar they would build for God.
God knows man. He knows that man will instinctively want multiple gods. It seems strange that He would have to give this command to His chosen people, but they disobeyed it repeatedly.
And Christians disobey it today. We don’t call them gods, but if we elevate them in importance so that we treat them as equal to God, then that’s what they are. We may refuse to admit it, but refusing doesn’t change truth. 😕