This would be error. Our Lord was one person with two natures.
Our Lord was fully God and fully man in an indissoluble union whereby the second Person of the Trinity
assumed a human nature that cannot be separated, divided, mixed, or confused.
One can best understand this union (together united in one subsistence and in one single person)
by examining what it is not, thus from the process of elimination determine what it must be.
The union is not:
1. a denial that our Lord was truly God (
Ebionites, Elkasites, Arians);
2. a dissimilar or different substance (
anomoios) with the Father (
semi-Arianism);
3. a denial that our Lord had a genuine human soul (
Apollinarians);
4. a denial of a distinct person in the Trinity (
Dynamic Monarchianism);
5. God acting merely in the forms of the Son and Spirit (
Modalistic Monarchianism/Sabellianism/United Pentecostal Church);
6. a mixture or change when the two natures were united (
Eutychianism/Monophysitism);
7. two distinct persons (
Nestorianism);
8. a denial of the true humanity of Christ (
docetism);
9. a view that God the Son laid aside all or some of His divine attributes (
kenoticism);
10. a view that there was a communication of the attributes between the divine and human natures (
Lutheranism, with respect to the Lord's Supper); and
11. a view that our Lord existed independently as a human before God entered His body (
Adoptionism).
The notion that the human nature assumed by God the Son was an individuated human being that could exist outside the assumption by the divine God is an error—a very dangerous one. Rather, what was assumed by the divine was not a person, for this would mean two persons existed in the incarnation, versus the one Person, the second Person of the Trinity. The divine and human natures are united only in the
person of Christ. The
communicatio idiomatum is this: What can be said of the two
natures can be said of the
person but what can be said of the
person cannot
ipso facto be said of the two natures.
The word nature and the word person are not interchangeable in theology. There are two
natures (human and divine) which are inseparably united in the one Person. These natures are are not to be separated, divided, mixed, or confused. Our Lord's incarnation does
not affect His Divine nature in any way, for there is no interaction or exchange between the two natures. The properties of the one nature never become the properties of the other nature. They are not separated, divided, mixed, or confused so as to lose their distinctiveness or to form a third nature. That said, these
natures do not function independently of the Person Jesus Christ as if they separate
persons. These natures continuously and simultaneously communicate their powers and qualities to Him without conflict.
See also:
http://www.desiringgod.org/articles/anhypostasis-what-kind-of-flesh-did-jesus-take
http://www.desiringgod.org/articles/enhypostasis-what-kind-of-flesh-did-the-word-become
AMR