I know of no one who believes the Shroud is authentic whose faith would be weakened in the slightest if it could be definitively proved that it is a fake.
You just don’t get it. Those who believe it is genuine do so because of the EVIDENCE. Absent the overwhelming evdence in favor of authenticity, we’d say, “can’t be sure whether it’s a fake or not, so fugeddaboudit.” For most of its history that was the attitude of most people, including most devout Catholics and including the hierarchy.
But then new evidence, sriking evidence, came to light in the late 1800s and early 1900s. The shift from “ho-hum” to “man-alive, I think this just may be Jesus’ burial-shroud” came in DIRECT RESPONSE TO NEW SCIENTIFIC EVIDENCE after 1900, especially in the last half of the 20th century.
This whole thing has always been evidence-driven. Some of those most strongly convinced of its authenticity were once skeptics who set out to prove it a fake. Many of them were and still are unbelievers.
I have offered you evidence why your snippy attitude is based on pre-judice rather than evidence. Have you ever even studied any of the evidence on this issue? Somehow I doubt it. But never let facts keep you from pontificating. It’s more fun to shoot from the hip.