I think it’s ‘historical’ only in the sense that the actual text is old, written a long time ago.
The principles are timeless and, yes, spiritual. Material values, and the way that we view historical works, may change over time; spiritual values don’t change.
The ‘Old Testament’ contains a lot of emphasis and wisdom as to how we should live our material lives, as well as harbingers as to what spiritual life has in store.
But The ‘New Testament’ represents an evolution to emphasis upon our spiritual lives. The purpose of the New Testament is to instruct as to the fact that we can, in fact, ‘Beam Up’.
Thank you for taking the effort and time to share your thoughts