Islam entered the region very early on, as a group of persecuted Muslims had sought refuge across the Red Sea in the Horn of Africa at the urging of the Islamic prophet Muhammad. In 1900, during the early part of the colonial era, there were virtually no Christians in the territories, with only about 100–300 followers coming from the schools and orphanages of the few Catholic missions in the French Somaliland. The Constitution of Djibouti names Islam as the sole state religion, and also provides for the equality of citizens of all faiths (Article 1) and freedom of religious practice (Article 11). Most local Muslims adhere to the Sunni denomination, following the Shafi'i school. The non-denominational Muslims largely belong to Sufi orders of varying schools. According to the International Religious Freedom Report 2008, while Muslim Djiboutians have the legal right to convert to or marry someone from another faith, converts may encounter negative reactions from their family and clan or from society at large, and they often face pressure to go back to Islam.