Oh, come on. They are not renouncing God. They are renouncing electricity, telephones, indoor plumbing, and higher education.
What does any of the modern technology have to do with the pacifism you suggested they should renounce? In taking up arms against their fellow man, even in self defense, they would be renouncing God, in their eyes. They aren't going to switch to your religion just because they've had one tragic event. They will continue to worship God, as they always have.