If you have not read it, this is a must read, first person account of the Discovery and Conquest of Mexico by Bernal Diaz.
Wherever you see the advent of Christianity, whether in the ancient Mediterranean or Conquistadorian America, the first thing that is banned is child sacrifice and evil rituals.
Archeologists have shown that the sewer systems of ancient Rome contained many small children's bones, a testament to the practice of abandoning and starving or killing children in ancient Rome, artifacts which continue for centuries, until their sudden disappearance coinciding with the widespread establishment of Christianity in the 4th century AD.