Roman Catholicism.
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Christianity is the religion. Roman Catholicism is one church or major division within Christianity. The Protestant Church and Orthodox Church are other major divisions.
Christianity
The most common religion is Roman Catholicism.(catholic)
The Catholic denomination is the largest Christian group in the world followed by protestants in England and the US.
Islam 45%Orthodox Christian 36%Roman Catholic 15%Protestant Christian 3%Jewish 1%
The Catholic Religion is the most common religion in Peru.
Islam
Christian, mostly protestant though the largest single denomination would be Roman Catholic.
53 percent Christian, 38 percent Hindu, and 8 percent Muslim.
The most common religion in Libya is Islam.
Roman Catholicism is the most common religion in Brazil.
what is the most common religion in south america
Christian