As I explained elsewhere on this thread, this history is important. The crisis at the time of the First Council of Ephesus was that there who denied the Divinity of Christ: the fact that He is a Divine Person, from which it follows that what is predicated of Christ, is predicated of God.
Everyone, even those confused by heresy, conceded that she Mary was the mother of Jesus. That was not in question. The question in dispute, however, was whether Jesus is divine, and was divine even from the moment of His conception --- and of course before His conception, for all ages of ages.
Some of those who were in error about this, said that He was a good man who, after a life of virtue, kinda "graduated" and was made God in the end.
The title "Mother of God" was not adopted in order to add a new layer of honor onto Mary, or to invent some new status, but as a way to assert the eternal and continuous Divinity of Christ. So, if Mary is the mother of Jesus, she is the Mother of God.
You can't quite "get" "Mother of God" unless you know precisely what question it was answering.
Therefore, the title “Mother of God” is less Mariological than it is Christological.
And what do we know about that??? Whatever we know about that we get from the scriptures and no place else...
We know that God was manifest in the flesh...We know that in some things Jesus was limited...Example; when speaking of the 2nd Coming, Jesus says he didn't even know the day nor hour even tho he says he and the Father are one...
Jesus' human was susceptible to aging and ultimately death...Was that a divine body??? We know that Jesus' body had to be changed before it was taken to heaven...
Some of us know that there is a spiritual circumcision where the body of Christians is separated from the soul and spirit which is an operation performed by God at the moment of receiving the Holy Spirit...Whereby, the body, the 'old man', is separated from 'new man' which is the soul and spirit...
We know that our 'old man', body, can not go to heaven until it is made incorruptable...And we know we are made in the image of God...
So was the body of Jesus divine??? So what evidence do have that Jesus' human body was divine???
It was actually a little more complex then that. Ephesus was the where the temple of Dianna “queen of heaven” was. There was a contentious group of businessmen who made trinkets and “rosaries” to the “queen of heaven” who thought they were losing their livelihood because of people converting to Christianity. It’s recorded already in Acts. So the direction to assign “queen of heaven” to placate that citizenry was already in the works long before the council in 341 or the one in 431.
I know why they claim they changed Mary's title to mother of God, nevertheless, what I said earlier still stands.
They'd have been better off correcting the doctrine than treating the symptom. Changing Mary's title only leads to MORE confusion and does not correct anyone's thinking on who Jesus is.