A couple of notes – Quetzalcoatl and Huitzilopochtli are still gods; it would be better to replace the units with their names with an embodiment of something else. Coatlicue – nagas, side view. It would be better to give them snake heads and human legs. Conquistadors would fit perfectly here – people from the Empire of the Falcon who adopted the faith of Caltzla, for which the priests armed them with deadly new weapons; the gunpowder for them is mined in the mines deep within the continent. Demons from Act 3 of Diablo 2 would also fit well.