Ethiopia important facts with regard to Ethiopia's currency change A wake up call | Memeher Mehretab Assefa important message on Ethiopia's current situation The Kingdom of Aksum in present-day Ethiopia and Eritrea was one of the first Christian countries in the world, having officially adopted Christianity as the state religion in the 4th century. Ethiopia was the only region of Africa to survive the expansion of Islam as a Christian state. Ethiopian Orthodox believers are strict Trinitarians, maintaining the Orthodox teaching that God is united in three persons: Father, Son, and Holy Spirit. This concept is known as səllasé, Ge'ez for "Trinity". Daily services constitute only a small part of an Ethiopian Orthodox Christian's religious observance.