No country is "overwhelming Roman Catholic". 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. According to the CIA factbook the only country which is 100% Catholic is, unsurprisingly, the Vatican. The following countries are over 90% Catholic:
Vatican City 100%
East Timor 98%
Malta 98%
Honduras 97%
Martinique 95%
San Marino 95%
Andorra 94%
Spain 94%
Cape Verde 93%
Argentina 92%
Colombia 90%
Italy 90%
Roman Catholic AnswerBrazil, a country that was colonized by the Portuguese, a Catholic country, was 76% Catholic in 1996, this is off nearly ten percent from the previous decade.
the US has about 24% of its population as Roman Catholic. Meaning that about 75,000,000 Americans are Roman Catholic. The largest of any other country.
Italy.
Because they were invaded by a catholic country when the Europeans colonised it.
Poland. In 2007 over 88% belong to the Roman Catholic Chruch.
Roman Catholic Answer:To the best of my knowledge, the only country in Europe which broke away, as a Country, from the Catholic church, was England. I believe that Spain is still nominally Roman Catholic.
Explorer Jacques Cartier came from France. As is the case now, France at that time was a largely Roman Catholic country.
Poland
brazil
Because Ireland is a Roman Catholic country.
Great Britain was heavily influenced by the Roman Catholic Church.
Well no country is "Roman Catholic": 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. For a list of countries world-wide and the percent that are Catholic, please see the link below. Saint Pierre and Miquelon are two islands that are 100% Catholic, Italy is 96.55%, followed by Malta at 95.34%, then Poland at 94.34%.