I have made the point several times that only the Five Books of Moses were written directly by G-d. Everything else in the Bible had to be canonized by a human authority (the Men of the Great Assembly canonized the Prophets and Writings; the Catholic/Orthodox Church canonized the "new testament). If you accept the canonicity of these books you should accept the authority of the canonizing body. But you apparently believe a big hand came out of the sky and gave Moses the complete Protestant bible all at once.
How do you prove the "new testament" belongs in the Bible at all? In fact, how do you know to believe in the Bible at all? It has to be authorized by an authority external to itself (G-d) or else it has no more meaning than the koran or the book of mormon.