How did Christianity change this culture?

From the previous Sawi culture to now, the Sawi culture took a huge leap forward. Before and when Don Richardson arrived there was still cannibalism and "fattening for friendship" a lot. There were wars when he was there as well and it seemed as if a lot of things in the culture was wrong and shouldn't have happened. However after receiving the Word, they changed dramatically knowing that what they were doing was wrong. This happened because Don Richardson finally found a connection to the way that their culture related to how God gave His only Son for the sins of the world. The leader of the Tribe was at first the only Christian but after sharing the connection of having to give his only son as well as a "Peace Child" and knowing that God did the same for him, helped in expressing his feelings to the other Sawi people. He then knew that people should not be eating and having wars because God had given His "Peace Child", Jesus, as the Peace Child for every wrong from one person to another. Knowing this and having felt this for the first time, the Sawi now realized that they have been doing wrong the whole time and now they are trying to follow the ultimate example of righteousness, God the father giving His only Son, Jesus, as the ultimate Peace Child.