Islam and Christianity are the top two.
Christianity
the Roman Catholic church has the most followers. if you view all denominations of Christianity as part of the one religion then Christianity would be an apt response to the question.
there religon is pie ish dude
Augustine
Most people follow religions brought to the continent by Europeans and Arabs
I think in Africa and usa, but im not sure
Arabic
While it is not fully known by historians what is the oldest religion in North America, it is probably the folk religion of the peoples who came over the Bering Land Bridge at the end of the Pleistocene epoch. This religon may be similar to the mythology of the Eskimos, and other indigineous peoples of the far northwest regions of North America.
North America, South America, Europe, Austrailia, and southern Africa
Dwight Eisenhower replaced Lloyd Fredendall with George Patton
The region of North Africa mainly practices Islam. Also, as a side note, Southern Africa (the region) mainly practices Christianity. Here's a link to a picture from Wikipedia's article on Religion in Africa: http://upload.wikimedia.org/wikipedia/commons/7/7f/Religion_distribution_Africa_crop.png