The Lao Song were taken to Thailand from northern Vietnam as prisoners of war about two hundred years ago. The group was first settled in Phetchaburi Province. The Lao Song were originally animists and strictly observed their animistic practices. Later on, they became Buddhists like Thai people. The relationship between Christianity and Laem Krachao villagers was formed under the patronage system. It started about twenty years ago when missionaries conducted vocational promotion for them and provided the villagers with economic assistance when their land and rice fields were flooded for many consecutive years. Interests for the villagers in Christianity were at different levels, ranging from involuntary participation in the activities, believing in the existence of God to being converted into Christianity. The first two groups outnumbered the third group. However, religious conversion was an individual matter. Each family still has the family head and male members carry out the animistic rituals of the clan. There were a few families where the heads were converted and completely abandoned animism. In this case, missionaries were allowed to take out ancestors’ spirit altars from their homes, causing the heads to be strongly criticized, and complained about by relatives and excommunicated by the community. Missionaries took a compromising stance with the ethnic culture when spreading Christianity by accepting the existence of their ancestors’ spirits. However, the spirits were allowed to live eternally in the Land of God through their children’s acceptance of the Lord. Restricting their faith in Christianity at the “believe” level enabled the ethnic group to hold on to its traditional social relationship structure while maintaining a good relationship with Christianity. The group also used such flexibility as a foundation for negotiating benefits from the religion.