I have to agree that logically it's hard to justify considering part of the Bible metaphorical and part as narrative.
OT, something that's always puzzled me is that if there were a God He'd know exactly how people would misinterpret an earth full of fossils and the way DNA is shared by all earthly creatures. So why create the impression of evolution? It would have been a lot more straightforward to remove misleading evidence than to simply say "God created" a lot of times in a book that most human beings who ever lived never read.
Maybe some day scientists will prove God.