Samoa is among the most thoroughly Christian societies in the world, and the fit between church and customary order is closer than anything in Europe. Under the fa a Samoa, authority rests with matai, holders of chiefly titles conferred by extended families, who sit on the village council. The church was absorbed into that structure rather than placed beside it: the village supports its pastor, who holds a standing comparable to a senior matai, contributions are announced publicly at collection, and the church building is frequently the largest structure in the village.
That integration has a coercive edge, and it is documented rather than alleged. Village councils have on occasion punished, fined or banished families for worshipping outside the denomination the village recognises, and such cases have reached the Samoan courts, which have had to weigh constitutional freedom of religion against the customary authority of the fono.
The London Missionary Society arrived in 1830, and the Congregational Christian Church of Samoa descends directly from it. Methodist, Catholic and Latter-day Saint churches followed, and the Latter-day Saint and Seventh day Adventist shares are among the highest anywhere.
The constitution declared in its preamble that Samoa is founded on God, and a 2017 amendment moved that clause into the body of the constitution, changing it from a statement of aspiration to an operative provision, a change argued for as recognition of what the country already was and criticised as narrowing religious freedom.
Pre Christian cosmology, in which Tagaloa is the creator and aitu are spirits attached to places and lineages, survives in oral tradition, in genealogies and in place names rather than in organised practice.