Is the Bible Gods' Word?

Whether Catholic, Protestant or a "Cultist," of the thousand - and - one - sects - and - denominations-of-Christianity, never will you find a missionary who will not prima facie, presuppose that his potential convert accepts his "Holy Bible" as the book of final authority on every religious opinion? The only answer the prospective proselyte has is to quote verses from the Bible which are contradictory to the missionary's or debate their interpretations.