Actually, if you approach the Bible like any other kind of literature you will see that there are books that are intended to be poetic and/or symbolic. Others are not (like Paul's epistles for example although he, too, uses metaphors from time to time).
You need to approach it with logic. When Jesus says, "I am the door" he's obviously not referring to Himself as a wooden slab with a knob. It's a metaphor to relate a spiriual idea. But when Paul addresses his letter "To the Colossians" one can infer that he literally wrote a letter to those who lived in Colossae.
There are many passages in Genesis that seem to obvious in their literal nature. For example...the story of Abraham. There's no indication that the writer of Genesis believed anything other than that Abraham, or Joseph, or Adam were real men.
As to the first chapters of Genesis...I understand that some people look at these as poetic literature. I see no indication that they were not intended by the writer to be as forthright as the story of Abraham. True, our finite minds may not be able to grasp the ideas, but that doesn't mean that God is not able to perform the acts just as they are recounted, for he is God.
But then where is any indication that John meant anything other than what he literally saw in Revelation or where is there any indication that Adam/Eve is not meant to be poetic metaphor? I don’t mean to sound harsh but I think taking the Bible too literally cheapens the deep and profound lessons and wisdom that are contained in it.