You can't take it literally and get to the truth. You have to take it as a metaphor and then run it through some loose-weave interpretation that generally applies to all that we currently know, but even there it sets us up for failure.

The idea of a big-bang is still on the edge of what we know of a universe. We cannot be sure the universe isn't and hasn't always been infinite. Why put an answer in there before we have a good idea of what we are looking at?

Using Genesis as a guide is folly, not only would we need a severe interpretation away from what it literally says, but we would need even more interpretation between Genesis 1 and Genesis 2 as both of these tales are contradictory to each other and they are nested as partner texts in the very foundation of at least one of the major religions texts.

Ideas of gods get us to a point of infinite regress and no further, if god made it all then who made god, and who made them, and who made them...etc. it doesn't have good explanatory power so why muddy the water by inserting god into the equation? It's unnecessary and nothing points towards that direction when you look at the science (observations of the universe). The idea of a god gets into modern science the way it originated in ages past. We become struck with awe at our ignorance and stand back and say, 'therefore god!' Then we look harder and have to revise our god idea, yet again when we realize that the substitution of a god answer only stops inquiry.

If you can know a truth separate from an objective truth, what the hell good is it? Your disbelief in gravity does nothing for you when you try to leave by the window on the fifth floor instead of taking the stairs. Good ideas comport with reality because it makes them useful ideas, worthwhile. Ideas that are different to you, me, and others are bad ideas. Ideas left to personal interpretation create separate and conflicting actions. I'm not saying religions are as a whole a bad idea, just that most if not all of them are rife with bad epistemology, favoring ignorance(faith) over really knowing a thing. I'll take the awe inspiring sun as it is, without the supernatural agency, it's more beautiful by far than the burning bush and the pillar of salt.