Copt
A drastic change happened to the Egyptian religious milieux when Egypt was taken over by Muslim general Amr ibn al-As in 639. Initially, Christianity was tolerated because they were redeemed as the Ahl al-Kitab, or the People of the Book. In return for tolerance, Christians had to pay the Gizya tax and were forbidden from entering the army. Although tolerated by the system in theory, in practice, Copts in Egypt suffered economically, and several uprisings against their Muslim overlords happened occasionally as well. Meanwhile to suppress the uprisings, the muslim governments from time to time also confiscated church properties and imprisoned some important members of the Church. As a result, a lot of them converted to Islam to avoid the heavy tax, and eventually by the Ninth century, Muslims gained the majority in Egypt.