Creation myths are how people try and explain that the world exists. These myths make sense to the people who constructed the myths. Most creation myths are palpably absurd or provide no good explanation.
The Christian creation myth is found in the very first chapter of the bible, genesis. The creation story has been interpreted a multitude of different ways, but most literalists believe that:
- The earth was created in a single day, along with most of the rest of the universe
- Every living creature, the sun, the moon, the stars, and the plants were a result of a literal six day creation
- The reason god took six full days to create everything was to show man that he should also work on six days, and rest on the sabbath
It is arguable whether genesis two is a completely different creation story, or its a far more detailed look at day six of genesis one, though most Christians hold the latter belief.
- The ancient Egyptians, believed three separate creation stories. There are some similarities. 
- Atum arose out of the primeval waters. He masturbated. Moisture arose from his semen and dryness from his breath. Note: There is no explanation how a complex reproductive system capable of producing semen arose out of (what?). Moisture and dryness copulated. This and further copulations led to everything that exists.
- Ra arose in an egg or a blue lotus due to some interaction between air and water. Ra created other gods and goddesses.
- Ptah is eternal like the Judeo-Christian god concept. The world and the rest of the pantheon exist because he spoke the word.
Native American creation myths typically focus on the creation of the Earth as opposed to the creation of existence itself. Also common is the theme of the Earth as the back of a turtle. One such example is that of the Iroquois:
- The Sky People lived in the sky as there was no Earth below. In response to the chief's daughter's illness, a hole for a tree was dugg, but the tree fell down to the ocean below taking the daughter with it. After landing on the back of a turtle, a toad went after the tree, brought back magic dirt that brought forth the growth of the land. All the animals pitched in to make a magic ball of light to be the sun.
http://www.dreamscape.com/morgana/cordelia.htm - Mayan, Micmac, and Scandanavian myths