The Heresy of Nestorianism
Nestorianism, named after Nestorius, The Patriarch of Constantinople in the fourth century, basically states that Jesus existed as two separate persons, the divine and the human.
One of the contributing factors leading to this view was an aversion to saying that God suffered and died on the Cross. To alleviate this supposed problem the adherents of Nestorianism stated that only the human Jesus, though perfect in His humanity suffered and died upon the Cross, and not the Divine Second Person of the Trinity. Nestorius denied that Mary was the mother of the Divine Jesus and was only the mother of His humanity
One of the major problems with this theory is that it threatens the very doctrine of the Atonement upon which Christianity rests. If only the human Jesus suffered and died then the sacrifice was not of divine quality and is of little use to fallen man. If Jesus was truly two persons when did they separate at the time of His suffering? Historic Christianity asserts that throughout His entire life upon this Earth Christ suffered humiliation and suffering culminating with His crucifixion and death.