Hi Gold Dragon,
I wanted to leave off this discussion as it seemed to be trending down the unpleasant path of name calling and labeling.
However I couldn't leave it without an apology to you.
I am sorry I misunderstood you,
Here are your exact words
You are suggesting the heresy of modalism when you say that Mary being the Mother of God is the same as being the mother of the whole Godhead (or the Trinity).
which BTW seems to have changed a bit (as indicated) since my cut and paste.
I am sorry I misunderstood you.
I am glad you brought it to my attention.
You will also note that I ceded my position somewhat for several reasons.
Also, I might as well answer other objections while I am here.
While there are cases where the Church use words and phrases not found in Scripture such as "Trinity", "missions", "Sovereign Lord" (although some MVs use this phrase) in the case of the phrase "Mother of God" it is historically a pivotal one which reformers, Protestants, Baptists, Anabaptist, etc have all almost unanimously rejected as a phrase which is unscriptural.
The Church of England equivocated the Marian Dogma and the title after Henry the Eighth and vacilated between the Church of Rome and the Church of England for several hundred years.
If one understands the issues of the Hypostatic Union and the distinction of the Persons of the Trinity then I will accept the phrase as scripturally allowable to remove the possibility of being accused of denying the deity of Christ.
However, from my experience as a former Catholic, I was taught taught in effect to worship Mary because she is "the Mother of God".
Bow before her (statue) make the Trinitarian sign of the Cross and address her the same as I would the omnipresent God. Then make my petition known to her as if she were the omnipotent God then thank her and have faith that she hears and answers prayer.
While it is true that the Church of Rome makes a semantic distinction between the worship given to God and the prayers to Mary (Latria vs. hyperdulia - worship vs. veneration) there were no differences taught to us in the practicalities of praying to "the Mother of God". Bowing, requesting, thanking, etc.
I left all that behind me over 40 years ago.
These are the reasons why I myself do not use the phrase.
Others may do as they see fit.
HankD