Proof the Bible is not 100% true:

It has been scientifically proven that humanity, with all its genetic diversity, did not start a few thousand years ago with two spontaneously created modern-looking human beings and their incestuous children.

It doesn't matter how many vague prophecies the Bible contains; we can say for certain that the Bible contains false statements. The question is, how many? Given the vagueness of the prophecies, I would venture to say that the writers of the Bible did not have any psychic future-predicting powers any more than the writers of the Qur'an, the Book of Mormon, or Dianetics.