On top of which Protestants claim to be saved by their Bible's alone. Reading the wrong version is a pretty big deal for them. (Less so for the Orthodox, who don't view the Bible as the standalone guide to Christianity or the sole source of doctrine)
The above is an extremely uneducated view. It would be like my saying that Catholics claim to be saved by the Pope alone.
Protestants claim to be saved "through grace alone, by faith alone, because of Jesus Christ alone."