The history of Christianity in Egypt dates to the Roman era as Alexandria was an early center of Christianity.
After Rome and Constantinople, Alexandria was considered the third-most important seat of Christianity in the world. The Pope of Alexandria was second only to the bishop of Rome, the capital of the Roman Empire until 430. The Church of Alexandria had jurisdiction over most of the continent of Africa. After the Council of Chalcedon in AD 451, the Church of Alexandria was split between the Miaphysites and the Melkites. The Miaphysites went on to constitute what is known today as the Coptic Orthodox Church of Alexandria. The Melkites went on to constitute what is known today as the Greek Orthodox Church of Alexandria.

Egyptian Christians believe that the Patriarchate of Alexandria was founded by Mark the Evangelist around AD 33, and Christianity entered Egypt because of The Apostle Mark.

By AD 300, Alexandria was one of the great Christian centers. The Christian apologists Clement of Alexandria and Origen both lived part or all of their lives in that city, where they wrote, taught, and debated.
With the Edict of Milan in 313, Constantine I ended the persecution of Christians. Over the course of the 4th century, paganism was suppressed and lost its following.
Although the main population of Christians in Alexandria follow The Coptic Orthodox Church of Alexandria, many other churches exist like The Greek Orthodox Church of Alexandria, The Coptic Catholic Church,

Saint Mark’s Coptic Orthodox Cathedral in Mahatet El-Raml

Saint George’s Church in Sporting

Saint Mina Church in Fleming

Church of the Annunciation

Saint Catherine Church in Mansheya

Saint Sava Cathedral

Saint Karas Church in Assafra