Well, then if you believe that Genesis is literal truth, then you have to believe that Revelation is literal truth and all that stuff about the symbolism reflecting the European Union, Iraq or whatever is wrong. There will actually literally be four horsemen, assorted beasts, etc. You can’t pick and choose which books to interpret literally and which ones to claim contain some cryptic code.
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.
Context is king. There are different genres within the Bible. One does not pick and choose. If you read the text within context, asking who, what, when, where, why and how, one should be able to ascertain what the text is saying without having to “add” to the meaning.
You are not the one to tell me what I “have” to believe.