The Genesis Creation Story does not owe anything to the creation myths of Egypt and Mesopotamia. The latter were written for a completely different purpose. They are not really about the creation of the universe at all. They are related to the "genesis" of a certain king's reign. Priest-scribes wrote them to establish the king's (and his god's) supremacy. Each myth is different with its local adaptations. The Biblical history has unity, never changing, as the myths do with each succeeding king.