Almost 50% of the population are Christian with about 90% of all Christians affiliated with the Roman Catholic Church. A small number of Christians practice Kimbanquism, a combination of Christian and native customs and beliefs which originated in the Democratic Republic of the Congo. Less than 2% of the population are Muslim, mostly immigrants from north and west Africa who work or reside in urban centers. The remainder practice traditional indigenous religions or no religion. With the approval of a new constitution in January 2002, freedom of religion is officially protected and discrimination on the basis of religious affiliation is specifically forbidden.