Find continents whose population professes the same religion.

There is no continent where absolutely all residents would profess the same religion. However, there are continents where all countries have the same main religion. Such continents are Australia (most Australians are Christians – Catholics and Protestants), South America (in all countries except Guyana, the majority of the population is Catholics) and North America (in all three countries of the continent, Christianity prevails, but if in the United States it is Protestant, then in Canada and Mexico the majority of believers are Catholics).