Every religion holds onto their own book or writings. Some use this fact as a excuse to say that the Bible can't be true, but how does a Christian respond? Answers in Genesis has some great points in this article.
Verses for Consideration:
2 Timothy 3:16 ESV
All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness,
2 Peter 1:21 ESV
For no prophecy was ever produced by the will of man, but men spoke from God as they were carried along by the Holy Spirit.