Martin Luther was the first person to translate the Bible into a language other than Hebrew/Greek/Latin. He was a priest and professor of theology, and understood the Bible well enough to write confessions based on it, and to debate and debunk the Catholic teachings.

Even if he did mess up the translation, there are many more translations, most made by scholars with a firm grasp of the original Greek and Aramaic, who have made highly accurate translations of it. There was no "rewriting" of the Bible, only translations of it into other languages.