yup, the Bible is the source of the Christian creation myth .. absolutely .. like i suggested there, it came from us .. here's one idea of why ..
Genesis Creation Narrative .. one bit ..
As for the historical background which led to the creation of the narrative itself, a theory which has gained considerable interest, although still controversial, is "Persian imperial authorisation". This proposes that the Persians, after their conquest of Babylon in 538 BC, agreed to grant Jerusalem a large measure of local autonomy within the empire, but required the local authorities to produce a single law code accepted by the entire community. The two powerful groups making up the community – the priestly families who controlled the Temple, and the landowning families who made up the "elders" – were in conflict over many issues, and each had its own "history of origins", but the Persian promise of greatly increased local autonomy for all provided a powerful incentive to cooperate in producing a single text.