Question

How does the religious affiliation differ between North and South America?

Answer 1

The correct answer is there are more Christians in South America than North America.  

The most professed religion in South American countries is Catholicism   (91.9% of the South American population is Christian, but less than half are praticant). This is probably due to the fact that the catholic faith was the only religion allowed in the colonial era and the indigenous inhabitants of these countries were forced to abandon their beliefs during the Spanish colonization and settlement in the Americas.

Answer 2

Religious affiliation differ in north and south America because :
there are more christians in South America than north America
Mostly because most of the southern America were conquered by the Spanish Kingdom

hope this helps