Yes, there is a reason. In the history of the Church, the Church had to combat various heresies about who Jesus is, who God is, what the Incarnation was, etc. Through the early Councils we arrived at what we now know as the Orthodox Christian Faith concerning Jesus, the Incarnation and the Holy Trinity.
During this time, as part of combatting heresy on the nature of Our Saviour, the dogma of the Mother of God was declared as opposed to those teaching contrary to the Orthodox Faith who wished to call Mary, Mother of Christ. Chief among these heretics was Nestorius.
In the eighth century, St. John Damascene compiled a summary of Church dogma. Below is the portion relating to your post.
But we never say that the holy Virgin is the Mother of Christ(4) because it was in order to do away with the title Mother of God, and to bring dishonour on the Mother of God, who alone is in truth worthy of honour above all creation, that the impure and abominable Judaizing Nestorius(5), that vessel of dishonour, invented this name for an insult(6). For David the king, and Aaron, the high priest, are also called Christ(7), for it is customary to make kings and priests by anointing: and besides every God-inspired man may be called Christ. but yet be is not by nature God: yea, the accursed Nestorius insulted Him Who was born of the Virgin by calling Him God-bearer(8). May it be far from us to speak of or think of Him as God-bearer only(9), Who is in truth God incarnate. For the Word Himself became flesh, having been in truth conceived of the Virgin, but coming forth as God with the assumed nature which, as soon as He was brought forth into being, was deified by Him, so that these three things took place simultaneously, the assumption of our nature, the coming into being, and the deification of the assumed nature by the Word. And thus it is that the holy Virgin is thought of and spoken of as the Mother of God, not only because of the nature of the Word, but also because of the deification of man's nature, the miracles of conception and of existence being wrought together, to wit, the conception the Word, and the existence of the flesh in the Word Himself.…An Exact Exposition of the Orthodox Faith by St John Damascene
D-fendr, I am not so sure that metmom shares the orthodox beliefs about Jesus with us.
I am glad to be in the same church as St John. Thanks for posting that. I’ll watch and see Nestorius’ defenders try to refute.