I have to confess that I've long feared Holy Fire might be a pious fraud, a technological derivative of the Greek incendiary weapon known as Greek Fire, which we have yet to replicate with certainty. But I hope to be proven wrong. I've seen scientific explanations involving white phosphor.
Now I have the utmost respect for our Orthodox bishops, but the Church of the Holy Sepulchre is, due to the multiplicity of jurisdictions present and the bitter relations between them, not IMO a good place. When you consider that even Coptic and Ethiopian monks, who are more closely related in terms of enomination than anyone else there, managed to get into a brawl, well, I just don't think the monastic climate is healthy. And it's not at all inconceivable that many pious and God fearing Patriarchs of Jerusalem have unwittingly participated in a pious fraud.
But I hope I'm wrong and it's real. I have confidence in the location of the Church, and in the finding of the True Cross and the other events surrounding the pilgrimage of St. Helena the wife of Constantine to the Holy City. And we do have the weird incident, perhaps caused by natural gas, of fireballs scorching the workers who under Julian the Apostate tried to rebuild the temple.
I really want to make a pilgrimage there, with faith, but bring my own measuring equipment. But if Holy Fire is a fraud it wouldn't shake my faith at all, since it's a phenomenon that started hundreds of years after that church was constructed and the devotional services established by blessed St. Cyril of Jerusalem, one of the most accomplished liturgists of all time, and it would be an isolated, if high profile, problem, confined to one patriarchate. Sort of an Orthodox equivalent of the stigmata of St. Francis.