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How nice for you to have all the answers. I am overawed.

how nice for you to have all the answers. And yes, this is being sarcastic.

Then cometh Simon Peter following him, and went into the sepulchre, and seeth the linen clothes lie,And the napkin, that was about his head, not lying with the linen clothes, but wrapped together in a place by itself. John 20:6-7

napkin - Greek soudarion - a cloth for wiping perspiration from the face and for cleaning the nose and also used in swathing the head of a corpse.

Jesus face and head was wrapped in a small cloth that was separate from the other burial clothes therefore the shroud cannot be authentic since it carries the image of a face. This of course assumes you believe the accuracy of the Bible. If you don't make that assumption anything is possible