Practitioners of Islam are in the overwhelming majority in Indonesia, but the group of islands in fact includes many different ethnic groups, each of which brings their unique style of ceremony and celebration to the joining of a couple in matrimony. One of the most important parts of the Indonesian wedding is declaring one's religion; the government of the country does not recognize unions that are not made under the auspices of some religion. Islamic marriages are not required to be registered in the Civil Registry, although those between other religions are.
Islamic marriages in Indonesia must be presided over by both a government official and a religious officiator.