Answer:
When you see the map that show amount of Christian population pre and after Spanish settlements, you'll notice a massive increase of Christian Population the regions within the regions controlled by the Spanish.
Unlike any other European Empire, Spanish government seems to care more about spreading Christianity than economic benefit.
On each regions of their settlements, they established a rule that made Spanish became an obligatory language for all the locals. On top of that, they're forced to adopt Christianity as their religion. Those who did not comfort will receive some sort of punishment.
