The constitution declares Islam to be the religion of both the state and its people. As such, over 99% of the population is Muslim, most of whom are Sunnis. The Qadiriya and the Tijaniya are influential Islamic brotherhoods. The few thousand Christians and a very small number of Jews are mostly foreigners. Though proselytizing is not legally prohibited, it is discouraged, particularly through restrictions on the publishing and distribution of materials that contradict or threaten the tenets of Islam.