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It will be impossible now I suspect to tell if the Turin Shroud is genuine or not. It is the only one of its kind in existence, so it was clearly preserved by followers who knew the person dead, to be of some importance. Christ had followers determined to keep his name alive and would and could very well have held on to the very burial cloth.
Faith requires an element of belief, whether you are a catholic, a muslim or any kind of christian spin off...they all require a belief in the particular religion being followed and a belief in the existence of say Jesus Christ. When I as a kid was shown the relic of some saint or other and we had many in Ireland, ones knees almost went weak, knowing you were standing next to something heavenly as worn by a saint while on earth. To agnostics it might be a piece of cloth, to the beleiver it might be the hem of a cloak worn by St Francis or someone similar.
Its fashionable to talk down religion. But over the centuries the Christian religion has given us culture on an unparalled scale. It has been the massive motivational force in much we treasure today. Paintings sublime, Music sublime..Buildings sublime...all motivated completely by a belief in the greater God.
So religion has given us many positives, including a blue print for decent living which we have followed in the western world for centuries, it was the original 'social charter' for good and fairness. Its falling apart somewhat now..that charter and all those religions, but we are probably much the worse off on account of it. People used to fear punishment beyond civil law, but not any more, now they get a £100 fine and their conscience is clear enough for them to go out and do the crime again. There are no brakes now. God supplied the brakes before.
By the way yes the image is a negative.