Why there is different denominations? Are they all Christians?
Over the years, some people interpreted the Bible their own way, or by interpreting a verse out of its context. We should abide with how the Fathers of the early church interpreted the Bible and observed the traditions of the Apostles. Because they lived at time that is so close to the time of Christ. Also, because at that time all Christians formed One Holy Universal and Apostolic Church. At that time all Christians agreed on the same dogma. Churches which were founded at the apostolic era are called Apostolic Churches. The Fathers put together the Creed which outlines the core teachings of Christianity.
We consider every church who believes and adopts the Creed as their proclamation of faith, a Christian church and not a cult. This does not necessarily mean that we agree on all their other dogmas like for example the Immaculate Conception, or the purgatory, or the salvation in a moment, among many others.
Within Christianity there is some essential doctrines such as:
- There is only one God (Exodus 20:3; Isaiah 43:10; 44:6,8).
- Jesus is God in the flesh. He is a complete God and a complete man (John 1:1,14; 8:24; Col. 2:9; 1 John 4:1-4) in one nature called "God Incarnate".
- Jesus rose from the dead physically (John 2:19-21; 1 Cor. 15:14).
- God exists as a Trinity of persons: Father, Son, and Holy Spirit. (See Trinity).
- Jesus was born of the Virgin Mary (The incarnation of the Word)
Any church that does not believe in such essential doctrines, is not considered a Christian church.