For most of us, the answer to this question is obvious. But I would like to come up with a controversial, alternative answer: I believe, that indeed, Jesus Christ is creation. Why so? The answer is found in Hebrews 2:16:
"For verily he took not on him the nature of angels; but he took on him the seed of Abraham."
Yes Brothers and Sisters, Jesus Christ is creation, because He became a part of creation, when He took on Himself the nature of a man! It's the only sense, in which we can speak of Son of God as being creation!
Of course this fact is so obvious, that even trinitarians can believe it (or at least believe similarly). If they do not believe, that Christ is creation, then they do not believe, that He became human. This can also be a clear evidence, that Jesus Christ was not creation from the beginning, because He is the Son of God Himself, and our Creator. Only after His incarnation in a human form, He became creation, and now He is, paradoxically, the Creator and creation at the same time. From this we know, that in Christ, God united Himself with the fallen creation.
"To wit, that God was in Christ, reconciling the world unto himself, not imputing their trespasses unto them; and hath committed unto us the word of reconciliation." (2 Kor. 5:19)
Trinitarians are often accusing nontrinitarians of believing, that Jesus is merely the first creation of God. This cannot be, because one creation could not become another creation (or not at least by itself). Only a divine being could, by kenosis, become a human being. I believe, that if we will stress the fact of Jesus Christ becoming a part of creation during His incarnation to a human form, then most of accusations, made due to a genuine ignorance of many Adventists on this theme, will probably cease to take place.
Hope you will benefit from this brief study, and of course I'm open for suggestions on this subject. Blessings!