Montezuma thought that Cortes was Quetzalcoatl because Quetzalcoatl was white and so Cortes is white.
Hernan Cortez was not a God but when he arrive to America (Tenochtitlán) the Aztec thought he was his God Montezuma because of his light skin.
Montezuma believed the Spaniards were the god Quetzalcoatl returning in human form because of various omens and prophecies. Additionally, the Spaniards arrived during a time of political unrest in the Aztec Empire, which made Montezuma more susceptible to believing in supernatural explanations.
The Quetzalcoatl is the feathered serpent worshiped by the Mayans. The Mayan leader, Montezuma, believed that the white men were the famous God returned.
Because he wondered if perhaps the prophecy of Quetzalcoatl was coming true.
Because the Aztecs thought the Hernen Cortes was the God Quetzalcoatl, God of Fear.
Because Montezuma mistook Cortes for the Aztec god Quetzalcoatl and Spain was inculed in it to
he was convinced Cortes was the great Quetzalcoatl who was a light skinned god and who was sent to earth to fulfill an ancient prophecy.
Montezuma I met with Cortez and exchanged gifts, believing he might be Quetzalcoatl returning as prophesied. Montezuma I welcomed Cortez into Tenochtitlan, but tensions rose as Cortez sought to conquer the Aztec empire.
Quetzalcoatl is important because it is actually said that Montezuma thought Cortes was indeed the God Quetzalcoatl, which legend said would return in the Mayan year one Reid. It turns out, by chance, when Cortes arrived in present day Mexico it was indeed the year one Reid. The Aztec God Quetzalcoatl was a light-skinned winged God. Seeing this magnificent white man ride in on a white horse really seemed to go along with the classic portrayal of their God, therefore really easily fooling the people. Soon after the Aztecs interacted with Cortes, history says most of Montezuma's people despised Cortes and didn't think he was really the God they originally thought him to be, but Montezuma was still unsure and therefore still feared Cortes; and did most of what was asked of him. Angering his own people. Leading to his demise later by his own people. Also interesting is that Mayan legend stated that Quetzalcoatl was driven out of the land that is now called Mexico, and exiled to the West. The legend that he would return on the year one Reid stated he would return via the West from the ocean... exactly as Cortes did. Leading to the mystery of who Cortes was.
Quetzalcoatl
Spanish missionaries claimed that Montezuma believed Cortes was Quetzalcoatl to validate the Spanish conquest as a divine event. By associating Cortes with a revered Aztec deity, it helped justify the conquest as a fulfillment of a prophecy, making it easier for the Spanish to convert the indigenous population to Christianity. This myth also served to elevate Cortes's status and undermine Aztec authority.