He obviously respects their free will, however.
During the first few centuries of the growth of the Church, there arose three Christological heresies which bear on the issue of the divine maternity. Docetism (110 A.D.), while acknowledging the divinity of Christ, rejected the reality of his human nature. Arianism (320 A.D.), on the other hand, accepted Jesus’ humanity but denied that he was the Son of God, the Second Person of the Trinity. Both of these heresies repudiated the dual nature of Christ and the mystery of the Incarnation. If Docetism was correct, Mary could not be called the Mother of God, since she would not be the mother of God the Son incarnate. If Arianism were true, Jesus was not divine, and Mary could not be considered the mother of God. At the First Council of Nicaea (325 A.D.), the first ecumenical council convened by the Church, both of these positions were condemned, and the reality of Jesus as true God and true man infallibly defined. The consequent document is known as the Nicene Creed.
After Nicaea a third Christological heresy arose, called Nestorianism (428 A.D.), which proposed two persons in Christ, rather than two natures in one person. Mary would then be the mother of the human person of Christ only, and therefore not the mother of God. Nestorianism was condemned by the third ecumenical council, held in Ephesus (431 A.D.). In substance, the council infallibly declared that Jesus was “according to his divinity, born of the Father before all ages, and in these last days, according to his humanity, born of the Virgin Mary for us and for our salvation . . . A union was made of the two natures . . . In accord with this understanding of the unconfused union we confess that the Holy Virgin is the Mother of God (, God-Bearer), through God the Word’s being incarnate and becoming man, and, from this conception, His joining to Himself the temple assumed from her.” The foregoing statement is taken from a letter of St. Cyril, bishop of Alexandria (444 A.D.), who presided over the Council of Ephesus. It is known as the “Creed of Union” or the “Creed of Ephesus.”
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Since you deny that Mary is the Mother of God and is the Mother of his human nature only, which brand of heresy are you guilty of?