The cultures of Mesopotamia had a polytheistic belief system, which means that the people believed in multiple gods instead of just one. They also believed in demons created by the gods, which could be good or evil. The people of Mesopotamia worshiped these other worldly beings to keep the beings happy, because if one of these powerful beings was angered then the people of Mesopotamia would, in some way, be punished for that unhappiness. They believed that when something bad happened, whether a natural disaster or not, it was because the correlating god was angry at them, so they did their best to keep the gods happy.
