Christianity believes and teaches that the Bible alone is the revealed Word of God. Even though it was written by men, the ultimate author was God. This claim was not invented by the Church, but a claim the Bible makes for itself.
“All men are like grass, and all their glory is like the flowers of the field; the grass withers and the flowers fall, but the word of the Lord stands forever.” (1 Peter 1:24-25)
“All Scripture is God-breathed and is useful for teaching, rebuking, correcting and training in righteousness, so that the man of God may be thoroughly equipped for every good work.” (2 Timothy 3:16-17)
“For prophecy never had its origin in the will of man, but men spoke from God as they were carried along by the Holy Spirit. (2 Peter 1:21)
Over two thousand times in the Old Testament alone there are phrases such as “And God spoke to Moses,” “the word of the Lord came unto Jonah,” and “God said.”
The mere fact that the Bible claims to be the Word of God does not necessarily prove that it is so. There are other books that make similar claims. The difference is that the Bible contain very strong evidence as being the actual Word of God.
One significant piece of evidence is the unity of the Bible. Although composed by men, its unity points to the hand of God. The Bible was written over a period of about 1,500 years by more than forty different human authors covering many subjects. Yet, from beginning to end, there is the unfolding story of God’s plan of salvation for mankind. This salvation is through the person of Jesus Christ.
“Jesus answered, “I am the way and the truth and the life. No one comes to the Father except through me.” (John 14:6)
Jesus Himself testified that He was the theme of the entire Bible.
“You diligently study the Scriptures because you think that by them you possess eternal life. These are the Scriptures that testify about me,” (John 5:39)
“And beginning with Moses and all the Prophets, [Jesus] explained to them what was said in all the Scriptures concerning himself.” (Luke 24:27)
The entire Bible is a unity with each part needing the others to be complete. There is complete harmony which cannot be explained by coincidence or collusion. The unity of the Bible is probably the strongest argument in favor of its divine inspiration. Other reasons could include the testimony of the early Church, the witness of history and archaeology, and the evidence of changed lives throughout the centuries.
The bottom line is that the Bible is special. It is unique. No other book has any such credentials. No other book even comes close.