Dear Duncan,
“Is the human nature Christ assumed created or not?”
To expand your question a little, we know that Christ was
A: fully and truly God
B: fully and truly man.
If A and B, then C: Christ must have retained both a God-nature, and a human-nature. If C, then was the human-nature created or not-created?
I doubt you refer to the physical human being? If yes, then clearly this was created.
You probably refer to the non-physical human nature of Christ? We go down the road of Nestorius or the Monophysites unless great care is taken.
I think it safest to adopt the mystery of the admixture of natures as defined by the Westminster scholars [VIII], or to adopt another approximate statement.
“II: The Son of God, the second person of the Trinity, being very and eternal God, of one substance and equal with the Father, did, when the fullness of time was come, take upon Him man's nature, with all the essential properties, and common infirmities thereof, yet without sin; being conceived by the power of the Holy Ghost, in the womb of the virgin Mary, of her substance. So that two whole, perfect, and distinct natures, the Godhead and the manhood, were inseparably joined together in one person, without conversion, composition, or confusion. Which person is very God, and very man, yet one Christ, the only Mediator between God and man.”
I guess I lean to asking ‘How does discussion about your question edify the saints, glorify God, and/or render the deserved praise and glory due to the Second Person of the Trinity?”
Dave Wood
Grace Community Bible Church
Melbourne, Victoria