If it wasn't for religion then the Spanish conquistadors would have never stopped massacring the native people of the Americas, and Mexico would just be a shittier Canada full of white people. South America would probably be entirely white as well.
Of course it's reasonable to assume that western civilization itself would probably not exist, so the world would probably look more like the Americas before ships arrived there. Mostly hunter gatherer societies that are in almost perpetual war with each other, never inventing so much as the wheel.
Gee wiz that sure would be a technologically superior way of life huh?