I’m reminded of the old hymn, “You ask me how I know he lives........ He LIVES within my heart.” The Shroud isn’t proof its an interesting artifact. The proof is in the power of possession.
Right on, bro. True faith does not need an object to believe. The flesh and fallen man’s unbelief always craves an object. The bible calls them idols.
And the worst idols are those that have legitimacy. God told Moses to make a serpent to lift up, that the Israelites who looked on it (faith) might be healed and forgiven. It was a picture of the coming cross of Christ.
Later the Israelites made it an idol, and worshiped it - the object - and missed the One to whom it pointed.
This is ever the case with man.
True faith simply believes what God has spoken.
“I do believe, Lord. Help Thou my unbelief.”