The answer to your question is very long and there is not enough space to relate all the info you need to know. This is only the initial explanation and the web site will provide more. Basically, it tells the reader about the similarities and the differences between it and all other civilizations at the time.
It is an anonymous story which was crafted and reworked by various Mesopotamian cultures including the Sumerians, Akkadians, Babylonians, and Assyrians; original story likely dates back to around the time of King Gilgamesh of Uruk (c. 2,700 BC); 1,600 BC recension by Babylonian priest-exorcist, Sîn-leqi-unninni. It is Mesopotamian epic poem originally written down by the Sumerians around 2,000 BC
Humanity made the transition from tribal lifestyles to the more complex forms of social organization we call civilization along four great river basins-in China, India, Egypt, and the Middle East. The Middle Eastern basin, which runs along the Tigris and Euphrates rivers in what is now modern Iraq), hosted a series of sequentially related civilizations that together are referred to as Mesopotamia. It is the oldest of the four early sites of civilization, predating the high culture of Egypt by thousands of years.
The Mesopotamians wrote on clay tablets, many of which have survived to the present. This ancient literature contains, among other compositions, The Epic of Gilgamesh. Humankind's oldest recorded hero tale (dating from at least 2000 b.c.e.), the epic is built around Gilgamesh's quest for immortality and is full of dream accounts. A legendary king who ruled the city-state of Uruk around 2600 b.c.e., Gilgamesh was said to be the son of the goddess Ninsun and the king Lugalbanda. His divine heritage on his mother's side, however, did not exempt him from mortality.
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A=postolic, B=eliever, I=n, O=ne, G=od, J=esus