Because he IS God. I know that sounds simplistic and much of it rests in the simple faith of a Believer. But look at it this way: God exists outside of time and space as we know them. He exists in eternity and can see the past, the future, and the present all at the same time. So when he created the world he knew my name. He knew I would accept Christ as my savior and he knew I would continue to sin. He even knew specifically what sins I would commit, but it's okay, because all sins: Past, present and future are forgiven by the sacrifice of Christ on the cross. In the past year or so, I have drawn so close to HIM that I try daily to actively do his will in my life. He has returned to me a sense of peace that I can't really describe.
Think of all the fortune tellers you've ever heard of. The Nostradamus, Edgar Cayces and the like. They all have to some extent a fair to decent track record. But the prophesy of God, is 100% to date. If I could recommend a good book, HIGHLY readable; I would recommend you buy Planet Earth: The Final Chapter by Hal Lindsey. It gives you a timeline of prophesy and explains it very clearly. I was printed in something like 1998 and theorized that just MAYBE Y2K might bring about the Final "End Time" event that many folks refer to as The Rapture. But as we all know Y2K was a whole lotta nothing. But the threat of terrorism (OK THERE'S the reference to keep this ON TOPIC!) and all the geopolitical issues it brings could very well trigger a cascade effect of prophetic events. One of these would be the re-building of the Temple in Israel. To do this the most Holy Mosque in Islam, known as The Dome of the Rock must either be destroyed or somehow relocated. Already both Islamic extremists and Jewish radicals have warned that this very event may be on the verge of occuring. The Islamists are fully capable of blowing up thier own Mosque, while full, and pinning the act on Israel so as to force all of Islam to unite in Jihad against Israel and the USA.
Also remember that nowhere in the Bible is the United States of America mentioned. I believe for the End Times to progress, we as a nation must be knocked off the seat of world power and authority. Knocked to our knees. Reduced to a third rate power, perhaps at the "mercy" of UN "Peace Keepers." I'm not saying that if this happens the people of this country would just roll over and grovel (well except for the liberals) at the feet of the UN. In fact, I think they have no idea of the difficulties involved in our "absorption." "Resistance is Futile?" NOT!