Different Denominations

The reason there are different denominations within Christianity is because the Bible allows for us to have differences of opinions. However there are a few essential doctrines that is central to the Christian Church.

These essential doctrines are,
Jesus is both God and man (John 1:1,14; 8:24; Col. 2:9; 1 John 4:1-4).
Jesus rose from the dead physically (John 2:19-21; 1 Cor. 15:14).
Salvation is by grace through faith (Rom. 5:1; Eph. 2:8-9; Gal. 3:1-2; 5:1-4).
The gospel is the death, burial, and resurrection of Jesus (1 Cor. 15:1-4; Gal. 1:8-9).
There is only one God (Exodus 20:3; Isaiah 43:10; 44:6,8)
God exists as a Trinity of persons: Father, Son, and Holy Spirit.
Jesus was born of the Virgin Mary (nature of incarnation)

If your church teaches otherwise, it isn't a Christian Church.