Christianity is kind of odd. It has the holy text of the jews as well as the holy texts of christians in 1 book.
Conservative christians tend to follow the OT far more than they do the NT. Obviously, liberal christians are the opposite.
Unlike other religions, christians generally admit that the bible has been altered constantly over the last 1800 years. There are also many translation errors.
In 1380'ish, John Wycliffe hand wrote the 1st ever English language bible, believing that everyone should be able to read it for themselves and not have the clergy be the only ones to read it. He and his followers made nearly 70 of these bibles. 44 years after his death, the Pope found out about his bibles, so he ordered his bones be dug up, ground up and thrown into a river.
In 1604, King James ordered that a single bible be made, because there were about 38 different versions floating around the UK at the time. It was at this time that many of the anti-women parts of the bible were added. It was approved and published in 1611. King James banned all other versions of the bible on pain of death.
Starting in the 1960s, there was a push by more liberal christians for a modern english version of the bible. Conservative christians were against any bible other than the KJV. As of last summer, there are 50 different versions of the english bible. Once again, they vary in how they were created. Some tried to stay true to the original Greek texts, while others tried to stay true to the KJV. Of course, there's everything in between.
NOTE: There are obviously other bibles in other languages, but I'm only talking about the history of the english versions.