FusionTheism - Atheists WANT the Bible to be interpreted literally so they can have something to attack.
I am an atheist, and it is not that I "WANT the Bible to be interpreted literally". It is that I am not arrogant enough to think I know what God (if he exists) may have meant or is thinking. Instead, I listen to a number of interpretations from theists. What I find is that the number of divergent interpretations (and denominations) leads me to believe that the Bible does not seem to have a clear objective mechanism that can be used to determine what is an allegory and what is not.
Historically, it seems to me that often an idea in the Bible is treated as literal up until the point that science, history, or modernity have left the claim no wiggle room, then "voila", it becomes an allegory. If the Bible is the vehicle for God to communicate with humans, it would seem to me that having it open to interpretation is a recipe for disaster.
So, that begs the question, other than personal interpretation, what exactly is the objective process to determine what should or should not be taken literally, or seriously, or relevant in the Bible?