Perhaps not to the likes of you and me.
Perhaps I would be less inclined to be an agnostic if it were proven real.
I'm inclined to think that proving it a fake, or of just another poor soul crucified by the Romans, would not shake the faith of a true believer. Maybe it would?
A “true believer” doesn’t have their faith built around that cloth (unless you mean they’re a true believer in the cloth... in which case, of course).
The better question is, what happens if *man* “proves” it’s real? False prophets, false idols, like I said at the beginning, and very dangerous for the people in this thread who’ve proven they fall into this category.
Hebrews 11:1 - Now faith is the substance of things hoped for, the evidence of things not seen.
1 Corinthians 2:5 - That your faith should not stand in the wisdom of men, but in the power of God.
John 20:29 - Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed are they that have not seen, and yet have believed.