Percentages of Catholicism in 2005 nations

Catholicism is the traditions and beliefs of Catholic Churches. It refers to their theology, liturgy, morals and spirituality. The term usually refers to churches, both western and eastern, that are in full communion with the Holy See.

In 2012, there were more than 1.1 billion Catholics worldwide. This makes up more than 17% of the world population.

The word "Catholicism" comes from the Greek word caholikismos (καθολικισμός). This means "universal".