Lets start the discussion today with the creation.  Every religion out there has a creation myth, and they seem to have similar traits.  usually there is some form of conflict which is then resolved and the resolving of the conflict ends with the earth somehow being created.  The Hindu believe that there was a serpent who kept back the waters and their gods(depending on the sect it might have been Vishnu, it might have been Indra) then slew him.  From my time in Asia, the most common belief is that Vishnu slew the serpent and cut its belly open, although the serpent will reawaken at the end of the world for a final battle.  In Christianity the belief is that before the world was created there was a war in heaven, which resulted in the casting out of Lucifer and his followers.  When they were cast out they fell to the earth, the similarity between the two stories is not always prevalent, but if you were to create a timeline for the war in heaven, it would appear that during the war the creation was begun, but was not finished until after the war as Satan was already present when Adam and Eve were placed on the earth.