A lot of stuff in the Bible was carried on through oral tradition.... there's lots of room for embellishment and such with that. Also, I don't think the Bible was originally written in English... another area for interpretation. And finally, people used allegories and symbolism to tell their stories.... I believe a lot of it is not to be taken literally... especially over thousands of years of revisions and whatnot.
"First there was darkeness.... then there was light...." ... much easier to say that than to tell people thousands of years ago about the Big Bang.
Just my opinion... well... actually .... many peoples opinion.
AK