It is continually changing. Being re-written, re-translated, or re-interpreted. And it will continue to change until people stop printing it. How many times was it changed in the dark ages, when it was copied by hand?
Inevitably. Improved scholarship means more accurate translations.
Of course, there are other reasons for variations and true believers may not be above giving it a "helpful" tweak here and there to support their own particular dogma.
The bible was written over 1600 years ago first in Hebrew then in Greek. The first person that God used was Moses in 1513 B.C.E. The last writer was the apostle John in 96 C.E.. Since then the Bible has been translated into 2,300 languages. The first English translation was authorized by King James of England,which was the language that they spoke then. Today we have the Bible in modern English and some of the expression used have been up-dated such as at Genesis 25: 29 ," On one occasion Jacob was boiling some stew when E'sau return from the field exhausted." New World Translation. King James Version says, at Gensis 25:29 " And Jacob sod pottage :and E'sau came from the field, and he was faint." And with all that we can still us the Bible to help us learn how to worship God in the way that he approves. John 4:23,24