Answer:
Both the Incas and Aztecs believed in and worshipped the sun god. Huitzilopochtli, also spelled Uitzilopochtli, also called Xiuhpilli and Totec “Our Lord”, Aztec sun and war god, one of the two principal deities of Aztec religion, often represented in art as either a hummingbird or an eagle. And Inti, also called Apu-punchau, in Inca religion, the sun god; he was believed to be the ancestor of the Incas. Inti was at the head of the state cult, and his worship was imposed throughout the Inca empire. He was usually represented in human form, his face portrayed as a gold disk from which rays and flames extended.
They both practiced and participated in human sacrifices. And had built large temples to do the sacrifices in and had built special temples to worship their god. The Incas and Aztecs both had a polytheistic religion meaning they only believed in one god.