Why do we believe the Bible? Is it because it's tradition? Because "it works?" Or is it because it's a reliable collection of historical documents written by eye-witnesses to supernatural events that occurred in accordance with specific prophecies demonstrating that it's divine, rather than human, in origin?
The latter is from Voddie Baucham's The Ever-Loving Truth, a book I recommended on this site a few years ago.
Amazon is offering the Kindle version (good on Kindles or their free Kindle app for most smartphones and tablets) for $2.99. It is well worth that, and I suggest you take advantage of this if you don't already have the book.