As an atheist, I am amazed how inconsistent Christians can be when interpreting the Bible.
For instance, literal days must be literal, as the OP indicated. But what about the firmament, with water above and below it, and where (i.e IN the firmament) the sun, the moon and the star are afixed. Why is the firmament not a problem anymore?
http://biologos.org/blogs/archive/the-firmament-of-genesis-1-is-solid-but-that’s-not-the-point