Another old question, but even the question has historical value---just like the bible itself.:
Here a definition of "historical value": Measure of the importance of a document (record) that justifies its permanent retention. Also called archival value, continuing value, or enduring value.
To learn about God.
It is a document that has very little historical value, but has played an integral part in understanding our cultural and philosophical growth as a civilization.
In my Opinion, the only power it wields is the power based on an individual's belief in it's claim to truth.
It has been used to indoctrinate future generations so as to ensure it's survival.