What causes relations to deteriorate between Moctezuma and the Spanish

Religion

Explanation:

The main reason for the deterioration of the relations between Moctezuma and the Spanish was disagreements between religion. Moctezuma trusted Hernan Cortes and showed him the Aztec Gods, especially the God of War called Uichilobos. Cortes that was a Catholic insulted Moctezuma's beliefs and told him that his gods were evil.