Latin
Latin.
Latin is preferred as this is the Language of the Roman Catholic Church and of the Roman Empire.
There is no "Roman" Catholic Church: Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is rarely used by the Catholic Church. The Chaldean Catholic Church is part of the Catholic Church.
Latin.
The Roman Catholic Church is a type of Christian Church.
Up until about 1963 the universal language was Latin
You would use the phrase Roman Catholic Church as a noun, because it's a name. For example, "The Roman Catholic Church is headquarted in Vatacin City" or "John is a member of the Roman Catholic Church". Tip: there is no Roman Catholic Church. It is the Catholic Church.
the Eastern Orthodox Church and the Roman Catholic Church
Well, actually, it's just the Catholic Church, not the Roman Catholic Church. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is rarely used by the Catholic Church. St. Paul was a Bishop in the early Catholic Church.
The Roman Catholic Church was modernized by Vatican II.
Mary is our mother in the Roman Catholic Church.
Roman Catholic Church in Piešťany was created in 1832.