Catholicism became the state religion of the Roman Empire in the 4th century, currently the following nations recognize Catholicism as their state religion:
(from Wikipedia)
Jurisdictions which recognize Catholicism as their state or official religion:
Alsace-Moselle
Argentina[2],
Costa Rica[3]
Malta[5]
Monaco[6]
Vatican City (theocracy)
A number of countries, including Andorra, Dominican Republic, El Salvador, Panama, Paraguay, Peru, Poland, Portugal and Spain give special recognition to Catholicism in their constitutions despite not making it the state religion.
Nicaragua's state religion is Roman Catholicism.
Queen Mary I practiced Catholicism. She was a devout Catholic and attempted to restore Catholicism as the state religion of England during her reign.
Yes, Catholicism is the state religion of Ireland, and 86% of the population are Catholic.
The Romans spread two different religions: pagan religion and Catholicism. In the early days of the Roman empire, they spread pagan Roman religion that is usually referred today as Roman Mythology. In 312 AD, Emperor Constantine converted to Catholicism, and made it the state religion in 313. After that point Catholicism was spread by the sword across the Roman Empire. This practice continued until the fall of the Roman Empire, and was picked up by most of the kingdoms that rose out of that collapse. The general way of spreading religion within the Roman Empire, and even more so by the governments that followed the fall of the Roman Empire, was if you did not convert to Catholicism, you died.
Catholicism became the official state religion of France in 496 AD when Clovis I, the king of France at that time, changed religions from paganism to Catholicism.
Although Spain no longer has a state religion but Roman Catholicism is still the religion followed by most Spaniards. According to an estimate 69 percent of people in Spain identify themselves as Roman catholic.
Catholicism is the state religion.
According to wikipedia, Christianity is the predominant religion, and Roman Catholicism is the official state religion according to the 1949 Constitution, which at the same time guarantees freedom of religion.
Roman Catholicism. After the Reform Wars (1857-1861) the constitution was changed again to favor a secular state, which has endured to this date.
The German States, prior to unifying into the German Empire of 1871, were always religious states, choosing either Roman Catholicism, Lutheranism, or Calvinism as an official state religion.
About 85 percent of the Philippines is Catholic.
It used to be Roman Catholicism in the past and then it was converted to Anglican where the head of the state (the monarch) is the head of the religious institution as well as far as I know