The theological questions really boil down to agreement on things that we cannot prove one way or the other.  While new agreement could change them (and they are incomplete either way, we cannot comprehend God in this life), the questions are mostly settled.  

As for scripture, understanding its evolution mostly impacts what we think of as the moral law.  That should be mutable because we are ever learning more about human nature.  Because we can use evidence (including history), we have to embrace change, especially regarding Leviticus.