May I remind you of the meaning of “idol”—to treat a creature as if it were God.
Where is your evidence that anyone anywhere ever treated the Shroud of Turin as God?
Words mean things. When you throw around the word idol lightly you bear false witness. Idolatry is a serious charge.
try suggesting that the shroud be burned , see what response you get . the shroud is being used as “proof” that Jesus was resurrected , but that’s what faith is all about . it’s why God didn’t announce where Moses was buried , because the Israelites would have made his burial site a monument . the only item we need to aim our hearts to is Christ