@neologist,
I think the biblical creation story is a sort of "summary" of what must have been, as seen through human eyes.
From the perspective of a human being, all things have a beginning, and so it is sensible to ask about the beginning of the world.
So the story assumes two things: Things that are now haven't always been. And there was a time when none of it existed.
So we try to picture this nothingness, and how it might come to be filled with ourselves and all the things we see around us. Given the cultural, environmental and biological conditions we exist under, a story about what might have taken place during the creation of the universe is bound to have a ring of truth, even if it comes only from addressing the questions we will inevitably have as listeners, giving answers that breathe life into the story, making us feel that it answers questions we have about reality.