Because of the Vatican’s duplicity (in the sense of "double dealing," "deception by pretending to entertain one set of intentions while acting under the influence of another"):
"duplicity … a. Deliberate deceptiveness in behavior or speech. b. An instance of deliberate deceptiveness; double-dealing. 2. The quality or state of being twofold or double. … [Middle English duplicite, from Old French, from Late Latin duplicits, doubleness, from Latin duplex, duplic-, twofold … acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another, double-dealing" The Free Dictionary, 15 November 2013).
in refusing to confirm or deny that any of its relics (in particular the Shroud of Turin), are authentic or not, it would not be surprising if the secular media assumes this is merely a stunt to win converts to, or prevent Catholics leaving, Catholicism. It seems two-faced for the Pope and his bishops to mount a huge ceremony featuring these bones and yet refuse to confirm or deny that they really believe them to be authentic.
And when Pope Francis says:
"How is this possible? How is it that the faithful, like you, pause before this icon of a man scourged and crucified? It is because the Man of the Shroud invites us to contemplate Jesus of Nazareth. This image, impressed upon the cloth, speaks to our heart and moves us to climb the hill of Calvary, to look upon the wood of the Cross, and to immerse ourselves in the eloquent silence of love." ("Turin Shroud: full text of Pope Francis’ comments," The Telegraph, 30 Mar 2013).
which, if it was translated correctly, means that Pope Francis thinks the Shroud of Turin is not even a relic, and is tantamount to him declaring it to be a fake!