My ancestors may have accepted Christ without ever hearing of the Catholic Church. And yet, I would never think of attacking the beliefs of those brothers and sisters in Christ in an effort to advance some agenda of my own, even though they have some articles of faith that I don't find in my Bible. But thanks for defining exactly how you need me to come to Jesus. If I am erring in believing in a miracle of God, I am sure He'll straighten me out in the first five minutes of the Afterlife, but I suspect, what with all the signing of praise and rejoicing, it's not going to really matter by then.
I don’t know how to respond because I don’t see what you see in the Shroud as a link to your faith.