It is indeed usually a good idea to learn something about the subject you intend to opine - rather than parroting profuse RC propaganda. Here, if "Roman Catholic" is a Protestant slur invented to make Catholics foreigners in their English-speaking countries," by using the distinguishing term "Roman," then your church is guilty of making that distinction, even if usually, but not always, adding commas and "apostolic:"
Ubi Primum, Pope Leo XII, May 5, 1824: "By heart we believe and by mouth confess the one Church, not of heretics but the Holy Roman, Catholic , and Apostolic Church outside which we believe that no one is saved.
Vatican Council I (1870): "The holy, Catholic, Apostolic, Roman Church ..."
Pope Pius XII Mystici Corporis Christi (June 29, 1943): "this true Church of Jesus Christ - which is the One, Holy, Catholic, Apostolic and Roman Church ..."
Pope Pius XII, Humani Generis (12 August 1950): "the Mystical Body of Christ and the Roman Catholic Church are one and the same thing"
The "Roman" distinction even preceded the Reformation, and continued after it began:
Dictatus Papae (1075): "That the Roman church has never erred; nor will it err to all eternity, the Scripture bearing witness.
Pope Innocent III profession required of the Waldensians: With our hearts we believe and with our lips we confess but one Church, not that of the heretics, but the Holy Roman Catholic and Apostolic Church, outside which we believe that no one is saved. (Denzinger 423)
Bull Cantate Domino, by Pope Eugene IV, 1441: "The most Holy Roman Church..."
Exsurge Domine1 promulgated by Pope Leo X against Martin Luther: "the eminent cardinals of the holy Roman Church ."
QUO PRIMUM TEMPORE, 4 July 1570 "the Holy Roman Church .." Pope Paul IV, Cum Ex Apostolatus Officio of 1559: "the Holy Roman Church ..."
Non-Catholics can be saved and they can be lost.
You mean Prots who do not convert to the Catholic church at the end are not lost?
Roman Church is the largest, and prior to the reunification with some Eastern Orthodox Church was then only Catholic Church. Naturally, she was called so often. For about a couple centuries at least it is no longer the case;; Melkites actually never went into schism to begin with.