Is the Bible and its divisions a porper noun?

The noun bible is a commonnoun, a general Word for any book that is considered the most important one for a particular subject; for example, 'The Physicians Desk Reference' is considered the bible of prescription drugs

The noun Bible is a propernoun, the name of sacred book of Christianity that includes the books of both the Old Testament and the New Testament; the Hebrew Scriptures, the sacred book of Judaism.