Although Egypt was a majority Christian country before the 7th Century, after Islam arrived, the country was slowly Islamified to become a majority Muslim country. Egypt emerged as a centre of politics and culture in the Muslim world. Under Anwar Sadat, Islam became the official state religion and Sharia the main source of law. It is estimated that 15 million Egyptians follow Native Sufi orders, with the Sufi leadership asserting that the numbers are much greater as many Egyptian Sufis are not officially registered with a Sufi order.