"The "unit" of interest is faith in Jesus Christ. I would not call myself a theist because I do not believe that other faiths provide a path to God. OTOH, I do think all Christians (all of those who accept Jesus as Lord and Savior) do."
I would accept that the unit of interest was "Christian," and not "Protestant" if the word "Christain" wasn't used in contexts where it was meant specifically to exclude Catholics. Go into any "Christian" bookstore and just try to find any of the world's most popular Christian books. Besides the bible, they aren't there, because books like "The Story of A Soul" aren't considered "Christian," but rather "Catholic."
Oh, and Protestants have understood that framing works for centuries. That was why they were so adamant at avoiding Latin-derived words and vernacular bibles... Any mention of a Latin word, and the commonfolk would've understood the word to have Catholic connotations. And of course you could claim any Catholic doctrine using such a word was non-scriptural. ("Purgatory" isn't in the bible because it's A LATIN WORD!)
And if you got the general public good and ignorant by imposing iconoclasm on illiterate folks, then you could say "Priests" aren't in the bible, but "Presbyters" are! (as if Priests isn't simply an Aglicization of "Presbyter.")
The term presbyter is never translated priest. In every case it is translater as either elder or bishop which two words always refer to the same New Testament office which is without exception made up of mre than one person. All holders of this office are equal to each other.