Ping!
..holy men of God spake as they were moved by the Holy Ghost(2 Peter 1:21)...
And check out the longest chapter in the Bible, Psalm 119, to get a drift about what God thinks about His Word.
The Bible IS the Word of God, and He used the Prophets and Apostles as His pen. So what do you say to those who claim otherwise? The same thing that Eve should have said to the serpent in the Garden oh so many years ago - when Satan first tried to cast doubt on God's Infallible Word (Genesis 3 - ...yay, hath God said...?):
....Although there may be more diplomatic variations - I'd go with: 'Spread your lies elsewhere pagan'.