How did Jesuit missionaries spread Christianity and Quichua in the Oriente?

In the Oriente region of Ecuador, Jesuit and other missionaries successfully spread both Christianity and the Quichua language, even as local Indigenous groups like the Shuar effectively resisted European military incursions.12

The spread of the language was facilitated by the colonial practice of using Quichua as a primary tool for evangelization. Missionaries were often required to learn the language to communicate with Indigenous populations. To further disseminate it, they relied on Quichua speakers who traveled alongside them during their missionary efforts and subsequent conquests, spreading the language orally throughout the region. This strategy was part of a broader colonial pattern where authorities promoted Quechuan languages because they were convenient for both government administration and missionary activities, often leading to the displacement of local Indigenous tongues.3124