The reason is because The Bible is the truth. If it was a fairly tale believe me. We would not be following it.
1 Corinthians 2.14-15
But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know them, because they are spiritually discerned. But he that is spiritual judgeth all things, yet he himself is judged of no man.
1 Corinthians 1.21-23
For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe. For the Jews require a sign, and the Greeks seek after wisdom: But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;
2 Corinthians 3.4
But if our gospel be hid, it is hid to them that are lost: In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.
@you cant live fore-ever.
Rachee is right and you are wrong. Matthew and John were both disciples of Jesus Christ. They were with Jesus during his ministry. Secondly, as Christians we believe that the entire Bible is God breathed (2 Timothy 3.16). It was written by humans who were inspired by the Spirit of the Living God. Please read my 3 Bible verses above which the Holy Ghost revealed to the Corinthians.