Sin is resident in corrupt human flesh, and so Jesus was the Last Adam, a new Humanity. We are transfered from Adam's humanity to Christ's.It's not a silly question to anyone who has a high Christology.
For we do not have a high priest who cannot sympathize with our weaknesses, but One who has been tempted in all things just as we are, yet without sin. (Hebrews 4:15)
How is it that the Son of God / God incarnate could be tempted as we are?
Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God; And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world. (1 John 4:2-3)
So, is the "Sin Nature" resident in human flesh, or should we regard Paul's use of the term "sarx" ("flesh") as merely metaphorical for the Sin Nature (as the authors of the NIV have translated)?
Were Jesus to have been born with a "sin nature", that would mean He was born in corrupt human flesh, and would not qualify for our sacrifice.
Much love!