About 55% to 60% of the population practice Islam, about 15% to 20% practice Roman Catholicism, and approximately 5% are Protestant. It is believed that a majority of the population also includes traditional indigenous elements within their religious practice. About 20% to 25% of the population practice traditional indigenous religions exclusively or principally. Citizens in rural areas tend to practice the traditional religions. Members of the Fulani and Dioula ethnic groups are predominantly Muslim. The majority of all the nation's Muslims are Sunnis, but minority groups belong to the Shi'a, Tidjania, and Wahhabite sects. A large number of foreign missionary groups are active within the country. Certain Muslim and Christian holidays are officially observed.