Naaji
I would agree with you that on the surface it would be easy to say that the Bible in it's entirety.. old and new testament has gone through changes.. so that instead of BEING the Word of God it now just CONTAINS the Word of God. Translations and the many versions of the Bible in existance would indeed lead one to think that there has been changes... problem is, if you follow that line of thought, all of us, regardless of how we view the Bible are then forced to ask ourself... Which parts are not the Word of God?
The Bible itself asserts in numerous places that it will not ever fade away or be lost
Psalm 119: 89, Isaiah 40:8, Matthew 5:18, Matthew 24:35 and 1 Peter 1:25.. and if any one really felt like changing any part of it.. read the result in Rev 22:18-20.
Interestingly, Jesus Himself used the words from the New Testament. The New Testament asserts that the Word of God is living and active and sharper than any sword. It penetrates .. it judges thoughts and attitudes. (Hebrews 4:13)
You see, one of the problems of saying that the New Testament is the work of mere humans is to forget that those words were written by men who were eyewitnessess of His Glory (John 1:14 and John 21:25) and asserts that men wrote as they were moved by the Holy Spirit. It was Peter one of Jesus's own Disciples and not Paul who said in 11Peter 1:19-20 that "above all you must understand that no prophecy of Scripture came about by the prophet's own interpretation. For prophecy's never had their origin in the will of man, but men spoke as they were carried along by the Holy Spirit".
Naaji.. even if the Bible did have man's words and interpretations in it.. my own knowledge of the way it changes my life and how God speaks to me through it, the mere fact it does have God's word in it according to your arguement, leads me to ask, who would therefore dare to decide which part is God's truth and which part isn't? It has survived many thousands of years, many attempts to destroy it and yet millions continue to asssert how it changes lives today even just by reading it.
Oh and in answer to your question, the OT is full of proof of the Triune God Head and the book of Hebrews in the OT is the best book to read of the fulfilment of all the purposes and the prophecy's of the OT Law through and in Jesus Christ.
God bless your search for truth
Carol_au