The churches I refer to were built in the 100 years after the conquest. When I was there in the late 1950s, there were churches were mothers would hang the umbilical cord of their infant in a nearby tree. I also viewed a ceremony in an Indian village that had not had a priest since 1935. It did not look entirely Catholic to me. It was 6 miles from the nearest road. We rode horses to get there. We went to the mayor and his two deputies, gave them some cigarettes and received permission to take photographs. They were the only people in this village of probably more than 500 who spoke Spanish. At that time there were several million people in Mexico who only spoke a native language, not Spanish.
I know the culture has been mostly replaced by a foreign one. Originally forced upon them true, but could it have all been? No, that’s impossible. They adapted, willingly for the most part.