It seems to me you have neither the education, experience, or authority to cast it away. If you always use a translation that has a different rendering (there are a few), what is it, for you are basing your reading on another's scholarship ?
And just what type of Biblical language training do you have?? You just take the pope's word and go home? Is he a Greek scholar??
CBs comments on Matthew 16:19 are correct. The Greek is the Greek. Doesn't matter if it's protestant or catholic.
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Parts of the Catholic Church (such as the "Greek Byzantine Catholic Church" (which is in full communion with the Roman Catholic Church) use the Byzantine liturgical rite in the biblical Koine Greek and modern Greek languages, and their membership includes inhabitants of Greece (as well as other countries).
Do you think they might know a wee bit of that "Greek"?