The Sumerian society was one of the earliest civilizations in Mesapotmia. The Sumerians had ideas about the universe, for instants they believed the world was flat, and that there was only Heaven and Earth, and that when you died you went to the underworld. Religion was very important to the Sumerians civilization. They, like most cultures from ancient history, were polytheistic, believing in and worshipping several gods at once. They believed that the gods controlled everything. The Sumerians believed it was their role in life to keep the gods happy and by taking care of them was of utmost importance. By doing this they believe the gods would keep their cities together and strong. The Sumerians saw most of their wealth and success from trade.