After the Schis, eastern churches became known as the orthodox and western became known as the catholic. The Orthodox Churches believe that their faith is the unchanged word of Christ; While Catholic Churches have embraced changes.
Cyril presented Christianity to the Slavs in their own language and invented an alphabet for the Slavic languages. The language he in invented became known as Cyrillic and was a big partl in helping him gain converts.
Islamic Armies conquered the cities of Israel and Syria. These cities had been important for Christians and Jews. This would lead to some conflict between the different religions. Damascus would replace Medina as the new Capital for the Islamic empire.
In the years after Muhammadâ€™s death, Muslims began to disagree over which leadership should replace him. Some believed that the Caliph or successor, to Muhammad should be a certain line of descendants of Muhammad while others believed a different line should become caliph.