A picture hanging in your office, dorm or home is a perfect conversation starter. It will become a point of reference that initiates opportunities for casual conversation. A book on the cocktail table will do the same thing. As people ask questions, you can review the evidence, explain the mystery and indirectly share the message. Check out The Store for posters, videos and other resources.
People are curious.
They have heard bits and pieces of information but few know the whole story of the Shroud. They have encountered a couple sound bites but little else. They may not want to hear about your church or your faith, but the image evokes a natural inquisitiveness. Maximize the mystery.