Ecclesiastical (or Medieval) Latin has a completely different pronunciation from Classical Latin as we now understand it. A friend, a few years older than I, attended highschool when the switch was made in teaching back to classical. Thus "civis", pronounced "cheevis" became "key-wis", etc.
Friend accepted it to a point, but then exclaimed to Sister Anna Roberta, "Sister, I refuse to believe that Julius Caesar said 'Waynie, Weedie, Weekie'!"
Weally?