The fact that God gave us the Bible is an evidence and illustration of His love for us. The term "revelation" simply means that God communicated to mankind what He is like and how we can have a right relationship with Him. These are things that we could not have known had God not divinely revealed them to us in the Bible. Although God's revelation of Himself in the Bible was given progressively over approximately 1500 years, it has always contained everything man needs to know about God in order to have a right relationship with Him. If the Bible is truly the Word of God, then it is the final authority for all matters of faith, religious practice, and morals.http://www.gotquestions.org/Bible-God-Word.html
All scripture is inspired of God and beneficial for teaching, for reproving, for setting things straight, for disciplining in righteousness, that the man of God may be fully competent, completely equipped for every good work. 2 Timothy 3:16,17
To prove that bible is god's words you must prove the existence of God first. You must also prove that this God thinks, acts, has objects, ends and aims. This is somewhat too difficult. It is impossible to conceive of an infinite being with a finite brain. As for the inspiration logic, NOT before about the 3rd Century was it claimed or believed that the books composing the NT were inspired. The truth is that the Protestants didn't agree as to what books are inspired till 1647, by the Assembly of Westminster. Even If the existence of God is admitted, how are we to prove that he inspired the writers of the books of the Bible? Did God use men as instruments? Did he cause them to write his thoughts? Did he take possession of their minds and destroy their wills? It will be remembered that there were a great number of books, of Gospels, Epistles and Acts, and that from these the "inspired" ones were selected by "uninspired" men. From all these books, and many others, the MEN selected the inspired ones. The men who did the selecting were ignorant & superstitious. They thought that diseases had been cured by the aprons & handkerchiefs of the apostles, by the bones of the dead. Many of the books now deemed spurious were by many of the "Fathers" regarded as divine, & some now regarded as inspired were believed to be spurious. Erasmus, one of the leaders of the Reformation, declared that the Epistle to the Hebrews was not written by Paul, and he denied the inspiration of Second & Third John, and also of Revelation. Luther was of the same opinion. He declared James to be an epistle of straw, and denied the inspiration of Revelations. Zwinglius rejected the book of Revelation, and even Calvin denied that Paul was the author of Hebrews.
Yes. God is the author of the Bible - at least the primary author. But He chose certain men to actually write the books of the Old and New Testaments under the inspiration of the Holy Spirit. During the first three centuries A.D., the Church discerned which writings were inspired by the Holy Spirit and included them within the list (called the "canon") of sacred books. Regarding the writing of these sacred texts, the Catechism states that God "made full use of [the human writers'] facilities and powers so that, though he acted in them and by them, it was as true authors that they consigned to write whatever he wanted and written no more" (Catechism 106). In other words, God did not dictate the words of Sacred Scripture to the human writers nor did He temporarily suspend their free will, style of writing, emotions, intellect, or cultural influences. (My answer continues in the comments)
Yes, the scriptures was inspired under the directives of Almighty God Jehovah (2 Timothy 3:16) It is similar to a secretary taking dictation from her superior - the words are not hers but she is being directed what to write and say according to the author. The Bible was written for man. Moses wrote the Bible about events before his lifetime, during his lifespan and after his life. The only way this would have been possible would be under the directives of God.
Thus saith the Lord: 2 Timothy 3:16 All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness that the man of God may be complete thoroughly equipped for every good work.