What role did religion play in strengthening royal power?

Religion played the most direct role in strengthening royal or royal power. Ordinary people were taught that the power of a king or king was given to him by God himself. And that all his decisions are dictated by higher powers. At the same time, the fulfillment of the orders of the king, according to religion, was considered a guarantee of future entry into heaven, since in serving the king, a person served God. But speaking out against a ruler or monarch was considered a mortal sin. Having committed it, a person was destroying his soul. And there is nothing strange in this, since it was stated that any confusion is caused by dark forces rebelling against the king and god.