Hi dark

,
I believe the Bible is the Word of God. Events in history have been prophesied beforehand and have come to pass validating the prophet along with the rest of his writings. Isaiah and Daniel being excellent examples.
If a prophet spoke for God, they had to bee 100 % accurate or the penalty was death. The prophet would give immediate prophecies concerning the people in that day an age and far off prophecies that concerned the "latter days". An example of this is Isaiah, The Assyrians had set a siege against Jerusalem and were threatening to destroy the city, but the prophet of God said that not one arrow would be shot into the city. The prophet was correct. Now he also received prophecies concerning the Messiah, the most known and loved by christians is contained in Isaiah 52-53, 700 years before the fact.
Now, more than a forth of the Bible was prophetic in nature at the time when it was written, there was validation then and the books were revered and kept safely by men of God.
There is still plenty of outstanding prophecy and some that has come to pass in the last century. For any student of prophecy the most important prophetic event in the 20th century was the reestablishment of the nation of Israel. Eschatology or the study of end time events centers around this event. Men in the early 19th century believed their Bibles and said that such an event would take place, knowing that God always keeps his word.
Now saying all that, this is only part of the validation for the christian.