It's just Catholic, not Roman Catholic. Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is never used by the official Catholic Church.
That being said, historically, France, Spain, Portugal, and southern Europe, including Austria, southern Germany, Italy, along with Poland, Ireland, Malta, etc. were mostly Catholic. Before the protestant revolt, they were all Catholic.
Most of them are Roman Catholic, as these regions were conquered or colonized by Catholic European powers; specifically France, Spain or Portugal.
Poland is mostly Roman Catholic and they are proud of John Paul II.
Most of them are Roman Catholic, as these regions were conquered or colonized by Catholic European powers; specifically France, Spain or Portugal.
Roman Catholic, Protestant and Islam
Mostly roman catholic
The Roman Catholic Church.
The Acadians were mostly Roman Catholic.
Most Irish are Catholics
Poland. In 2007 over 88% belong to the Roman Catholic Chruch.
Today the Philippines is mostly Christian and Roman Catholic.
Christianity. Most of the Continent is mostly Roman Catholic, while Protestant is prevalent in several regions, such as the United Kingdom and northern Germany. Eastern Europe tends to be Orthodox.
Mostly roman catholic and in mindanao its Muslim