What I find interesting in the Creation Myths that we have read so far is the generally universal portrayal of social realities in the mythology itself. For example, the Greco-Roman world is a very patriarchal society. This is strongly reflected in Greco-Roman mythology. For example, the head of the gods is always a male figure. For example, Zeus is the head of the Olympian gods. The head of a Greek or Roman family is also always a male figure, typically the father.
Mesopotamian mythology reflects the shift which gradually occurs from a matriarchal society to a patriarchal society. This is primarily reflected in the change of portrayal of the goddess Tiamat from a positive maternal figure, to a negative monstrous figure, (described in more depth on pages 65-66 of the text). This also demonstrates the changing attitude of society towards women as the shift to a patriarchy occurs.
I find that the reflection of societal realities in mythology is perhaps intended as a justification for the way society is. The gods modeled the world after themselves to be the way that it is.