Here is just one verse that is significantly changed in the newer versions.
1 Tim 3:16 And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.
The KJV says God was manifest in the flesh. This is the strongest verse in all of scripture proving Jesus is God. What do the other versions say?
Here's the NIV
1 Tim 3:16 Beyond all question, the mystery of godliness is great: He appeared in a body, was vindicated by the Spirit, was seen by angels, was preached among the nations, was believed on in the world, was taken up in glory.
How about the RSV?
1 Tim 3:16 Great indeed, we confess, is the mystery of our religion: He was manifested in the flesh, vindicated in the Spirit, seen by angels, preached among the nations, believed on in the world, taken up in glory.
How about the ASV?
1 Tim 3:16 And without controversy great is the mystery of godliness; He who was manifested in the flesh, Justified in the spirit, Seen of angels, Preached among the nations, Believed on in the world, Received up in glory.
Only the KJV tells you Jesus is God, do you think that is an important difference between these versions? I do. So I reject your argument that the letter of scripture is not important. It is vital.