Some believe that particular aspect of the creation story had its origins in earlier Mesopotamian creation myths<quoted text>
Creationism is a the Christian (and possibly Islamic?) biblical belief that the earth and everything in it was created in 6 days.
"Panbabylonists believe the creation myth in the Book of Genesis came from older Mesopotamian creation myths. The Mesopotamian creation myths are recorded in the Enûma Eli(or Enuma Elish), the Atra-Hasis, the 'Eridu Genesis' and on the 'Barton Cylinder'. Although the plots are different, there are similarities between the Mesopotamian and Jewish myths.
In the beginning of both myths the universe is shapeless and there is nothing but water. In the beginning of Enûma Eli there is Abzu (freshwater) and Tiamat (saltwater), which mingle together. In the beginning of Genesis, "darkness was over the surface of the deep" and the Jewish god Yahweh is "hovering over the waters".[Genesis 1:2] It has been argued that the Hebrew word for "the deep", tehom, is cognate with tiamat.
In the Enûma Eli there are six generations of gods, created one after the other. Each god is associated with something, such as sky or earth. This parallels the six days of creation in Genesis, where Elohim (plural) creates a different thing on each day.
In the Enûma Eli, the sixth-generation god Marduk consults with other gods and decides to make mankind as servants, so that the gods can rest. Likewise, Elohim makes mankind on the sixth day (saying "let us make mankind in our image") and then rests.
In both myths, day and night forego the creation of the luminous bodies (Genesis 1:5, 8, 13, and 14ff.; Enûma Eli 1:38), whose function is to yield light and mark time (Genesis 1:14; Enûma Eli 5:1213)."