[maryz]

Nestorianism separates Christ's human and divine natures, claiming that Mary is mother of his human nature only -- that sounds like what you believe. It was condemned by the Council of Ephesus in 431; in condemning Nestorianism, the council confirmed Mary as Theotokos (she who bears God), a title already long in use.

Briefly, from Wikipedia:

Since mainstream Christians understand Jesus Christ as both fully God and fully human, they call Mary Theotokos to affirm the fullness of God's incarnation. The Council of Ephesus decreed, in opposition to those who denied Mary the title Theotokos ("the one who gives birth to God") but called her Christotokos ("the one who gives birth to Christ"), that Mary is Theotokos because her son Jesus is one person who is both God and man, divine and human.

[HossB86]

Did you read what I said I believed? Jesus is fully God and fully man. I don’t believe, as Nestorians do, that there is some sort of disharmony or understandable separation. Jesus is The Word made flesh. I don’t understand it. I believe it. I don’t believe the Roman Catholic Church’s elevation of Mary beyond what is in Scripture.

Hoss