Abraham repudiated the Mesopotamian idolatry while still in his youth, and instituted the worship of One God, creator of the universe; a worship that has survived and spread to this day.
http://judaism.answers.com/jewish-history/a-biography-of-abraham
They had a polytheism
the sumerians practiced polytheismThe Mesopotamian Religion was Polytheistic, they had a pantheon of several hundred gods.
MESOPATAMIA
An ancient Sumerian city located in southeast Iraq. Biblically, the birthplace of Abraham. ur was a name of a city in mesopotamia
They both had a polytheistic belief.
The uncertain flooding of the rivers
Yes, they believed in many gods.
Abraham is an important figure in the religious traditions of Judaism, Christianity, and Islam. According to the Hebrew Bible, he is considered the patriarch and progenitor of the Israelite people. He was born in Ur, a city in ancient Mesopotamia, and is known for his covenant with God and his journey from Mesopotamia to the land of Canaan.
The primary focus in Mesopotamia was Idolatry. They had gods for just about everything and situation.
Ancient Mesopotamia was home to a host of religious beliefs and traditions, as it was inhabited by a number of people--the Assyrians, the Sumerians, and the Babylonians, for example. Characteristic of them all, however, was polytheism.
The Akkadian religion was an ancient religion in Mesopotamia, during the reign of the Akkadian Empire. The sun god, Shamash. emerged as its most important god.
The king of Ancient Mesopotamia was King Hammurabi.