God is a God of prophecy (Revelation 19:10). In fact, roughly two-thirds of God's word is related to it. The Bible is the only book in the world ever written that can demonstrate its inspiration is supernatural and that it is from a Being Who exists outside this physical realm of time and space.
Prophecy is simply history written in advance of the actual event. Its fulfillment is a major proof of God's existence - and more. It attests to his authority and power to influence people's lives and foreordain the course of events here on planet earth. God not only gives prophecies in the Bible on what will happen in the future, he has the ability to cause his predictions to come to pass in every detail within a specified time frame.
Scoffers of prophecy and its claim of divine origination may state that fulfilled prophecies are nothing more than lucky guesses. Attributing successful long-term predictions (sometimes spanning several centuries or millennia) to guesswork and luck, however, is preposterous. Their divine spiritual origin attests, however, to the moral standards of God's word, such as on sexual morality, should not be lightly dismissed. The God who destroyed the cities of Sodom and Gomorrah, and who predicted the destruction of Babylon and Nineveh, is very much alive and well.