Well, that's the point. Those different "versions", not even one of them belongs to the messiah himself and they've been altered many times due to the cultural and civilization change over the course of centuries has done a massive impact and influence on Christianity and the Bible. Even the Christmas that's going on nowadays was originally a Roman pagan religious tradition, the trinity is also not originally Christian. Old Egyptian religion, Buddhism, Pagan Roman religions, Judaism (after it's also been changed), etc, all left their touch on the current Bible. It's scientifically and historically proven that the Bible been changed and even many Popes and Priests have admitted it before, it's not a criticism or a conspiracy, it's plain truth that everyone has always known since the middle ages. Also, the over 100 contradiction in the bible and the massive amount of conflicting stories is sufficient to make sure that it's been changed. You might be asking, why then the Quran has not changed? It's for two reasons, Allah promised that it will never change : (15:9) As regards this Admonition, it is We Who have sent it down, and We Ourself will preserve it. *6 People saved the Quran in their memories and hearts since it's been sent to them, that's why it couldn't have been changed since it wasn't just written on paper.