The difference here will always be about faith. Oral tradition is an important channel of transmission of information throughout the ages and cultures (I actually mentioned that on previous post in other threads on this subject) but, reliable as it might be, it isn't a verbatim record of what was said or done. Besides, the reliability of a medium does not vouch for the factuality or accuracy of the message. Reading the New Testament you don't find an detached approach to the matters - there's a literary passion to the texts that infuses them with life and, in the end, contributed directly to its following by what would become Christianity. Besides, the fact that real people, places and occurences are mentioned throughout the bible doesn't automatically mean that everything there is true: the bible will never be an unbiased collection of accounts. In the end where does all this leave us? The faithful will see the book as a source of spiritual and religious illumination, a reference point to their belief in Christ. The agnostic (like me), will see an interesting book that opens a fascinating window into the minds, culture, beliefs and hopes of two of the biggest religions in history.