The answer
There are two levels: firstly, the Christians - those who believe in the divinity and incarnation and redemption of Christ - basically, those who believe in the Christian creed. Secondly, there are Christians who are Orthodox, Catholic and Protestant. Each differ in details concerning doctrines, the sacraments and priesthood and fellowship with the saints, but we agree on the major concept of Christianity which is the Creed, and so therefore we are ALL Christians. Therefore we must never condemn other Christian denominations that believe in the Lord, saying that they are not going to heaven. This is not our capacity and is completely illogical, because they believe in the creed which is the essence of Christianity.
H.G. Bishop Moussa