1) We have very little original documents that are 1600 years old. Note I said 1600 and not 1800 or 1900. This document would have more religious authority weight if it was not 300 to 400 years removed from the time of Christ.
2) Most people do not know anything about Christian history, because of which most people don't know there were hundreds of Jesus stories. most people don't know the modern new testament was organized around 367 AD (also known as Common Era), and it wasn't till 180 AD that people actually started to state that the 4 gospels are the only gospels you should care about and the rest are "illegitimate."

I say anything that makes people learn a little more history is a good thing.

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This is assuming the whole thing is not a forgery, which there are way too many throughout christian history. I feel sorry for my grandmother who is a very devout catholic and how much it means for her to see the Shroud of Turin, and how she tells the story of that pilgrimage as well as others she has done throughout her life. I have to bite my tongue and not say that the shroud of turin is most likely a fake for radiocarbon dating shows it is from the 13th or 14th century which is ironically the same time it was "discovered."