Ephesus affirmed that our Blessed Mother can rightfully be called the Mother of God: Mary is not Mother of God, the Father, or Mother of God, the Holy Spirit; rather, she is Mother of God, the Son Jesus Christ.
Nonsense...You can't separate God from the Holy Spirit from Jesus...They are one...If Mary is the mother of God, the Son, she would also have to be the mother of God the Father...And that's ridiculous...
And then that religion had Nestorius deposed and exiled...
How it really is:
The Virgin Mary is the Daughter of the Father, the Mother of the Son, and the Spouse of the Holy Spirit. Such is her relationship with the Holy Trinity. She is unique in all creation and played a unique role in salvation history.
If you find it difficult to wrap your mind around these mysteries, feel free to join the club. None of us will fully understand these things, because we are not God. But one thing we do know is that “the foolishness of God is wiser than the wisdom of men.”