I'm not sure what "many versions" of the Bible you are referring to, I'm only aware of one.
I'm not sure how this is possible. There are multiple English translations alone, and obviously the original texts were not written in English. There are huge issues with translations. One small example is the fact that a word we now know of and Christians accept as "virgin" when used to describe the mother of Jesus originally meant "unmarried" in an ancient text. At the time of Jesus' birth, as I understand it, there were not separate words for a person who had not had sexual relations and an unmarried person since the act of intercourse is what defined you as married.
I was a religious studies major so this topic interests me. It was my goal to learn ancient languages so I could, as best as one can with incomplete texts, attempt to read the oldest possible versions in the language they were written so that I could ascertain for myself what was there and what wasn't. I wasn't able to continue my studies, though, and was forced to leave school early. (What sort of fool tries to learn Greek AND Hebrew at the same time? This gal.)
Additionally, there are various religions and generations of the church that embrace or reject wholly different editions of the Bible. Consider the Apocrypha, which I never knew existed during my upbringing in the Christian church. Imagine my surprise when I was presented with a "Bible" for my first history of Christianity class that contained an entire set of books that I'd never heard of. These books were fully accepted as a part of the bible until the 16th century, yet I had never heard of them.
The Bible that I carried with me to Sunday School my entire young life does not in many ways resemble the text as originally assembled. The key word here is "assembled" as the Bible is a collection of writings that have been collected and compiled in various ways throughout the centuries as well as widely edited and subjected to countless translations.