The Sumerian culture is known to have a polytheistic religion for Sumerians believe that they were supposed to obey and served their gods and goddesses for it has these enormous power. They believe that the success in every area of their life depends on how they please their gods for people relied on their gods power over the sun, rain, crops, wealth and health.
Moreover, the Sumerians believed that their gods choose where people would be placed on social hierarchy and the priest are the one who interpret the wishes of the gods and made offerings to them.