The Articles of Religion of the Church of England:
"II. Of the Word, or Son of God, which was made very man.
THE Son, which is the Word of the Father, begotten from everlasting of the Father, the very and eternal God, and of one substance with the Father, took man's nature in the womb of the blessed Virgin, of her substance: so that two whole and perfect natures, that is to say, the Godhead and manhood, were joined together in one person, never to be divided, whereof is one Christ, very God and very man, who truly suffered, was crucified, dead, and buried, to reconcile His Father to us, and to be a sacrifice, not only for original guilt, but also for all actual sins of men."
The piece below from Mascall outlines the orthodox realities of the Incarnation--Christ is fully God and fully man, not simply a deity taking on the flesh of man as though putting on a costume, but a real individuation of humanity. Christ took on not only the human body (soma) but a human body informed by a human nature, a human soul (soma psuchekon). He is not only co-substantial with God the Father, but co-substantial with humanity as well. He suffered, was crucified, died, and was buried. He died not only for original guilt, but also for actual sins. This eliminates any consideration of adoptionism, docetism, or gnosticism. Again, here we have nothing more than a summary of orthodox Christology; it goes beyond the Nicene Creed to some extent and clarifies the teaching.