Why are some so concerned about Jesus' DNA?

People are anxious to have irrefutable proof - just like Thomas.

Anna the Seeker said:

I've come across debates about the blood of Jesus, whether it was assumedly found on the Shroud of Turin, the Ark of Covenant, or elsewhere.

Wouldn't Jesus' spirit make the actual Jesus and not his DNA? God has a control over the DNA.

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While worrying about things like the Shroud of Turin is ultimately irrelevant. What makes Jesus Jesus is that He's Jesus--God-and-man.

Our Lord wasn't/isn't a spirit in a body, but the God-man, the Incarnate Logos. So Jesus' DNA certainly did make Jesus Jesus. In that He being the Son of Mary, the offspring of David, etc is who our Lord Jesus is. The alternative is a deeply heretical conception of Jesus that becomes very Gnostic very quickly.

-CryptoLutheran