In the context of the film, it was like many of the Catholic relics that abounded in years gone by. in the middle ages, there was even a commercial industry built up around the production and sale of bogus relics. These relics (Like the robe, the holy grail, the shroud of turin, etc) were believed to be holy and therefore contained the power to heal or promote revelation. Many of these artefacts have been lost to the mists of myth and legend, or they have a question mark of doubt over them, that they may have been faked in one way or another.
The only genuine source of healing and revelation is God himself. He chooses channel for this power, and the Bible shows that he has not chosen any kind of relic for this purpose. More information can be found at this web site.