That's not why the Mass was and is celebrated in Latin, the history is much more complicated than that, as it usually is when discussing languages and culture.
Ok....there's a lot to unpack there. I'm sorry you seem to have a dislike for the Catholics. I hope you will go further than wikipedia in your future research. Catholic Masses have always been celebrated in Latin and still are to this very day, along with thousands of other languages. Have a good Sunday.