Here is a short but telling quote from C. S. Lewis:
“All I am in private life is a literary critic and historian, that’s my job. And I am prepared to say on that basis if anyone thinks the Gospels are either legend or novels, then that person is simply showing his incompetence as a literary critic. I’ve read a great many novels and I know a fair amount about the legends that grew up among early people, and I know perfectly well the Gospels are not that kind of stuff” (C.S. Lewis, Christian Reflections, 209)
Now remember that Lewis taught at both Oxford and Cambridge, and as a student achieved a prestigious “triple first,” the highest honors in three fields of study. He was no slouch, and his areas of specialization was literature. So all this malarkey about the bible stories being taken from earlier literature are debunked by Lewis.
Further attestation to the uniqueness of the gospels are found in the works of Edwin Yamauchi and the works of Ron Nash, who have definitively debunked the fantasy that the gospel accounts were taken from earlier non-Christian literature, such as Isis stories and the like. Yet we still have skeptics running around making pot shots, claiming that Christianity borrowed from pre-Christian myth literature. Their position has been thoroughly debunked by Lewis, Yamauchi, and Nash. The Bible is true, and the history is from eyewitness testimony.