Answer:
They viewed them as heresy and evil for them to eradicate and replace with their own benevolent and true God.
Step-by-step explanation:
During the 16th century, the Spanish created an empire in parts of North America and most of South America. The Spanish were very religious, they also were responsible for establishing the Spanish Inquisition which killed a lot of people and consolidated the power of the Spanish monarchy with the Catholic faith. They were also very aggressive towards the Native Americans religion, they destructed their sacred structures and images and forced them to convert to the Catholic Faith as a way of domination.