Right, I short-handed it. If an event occurred that is quite contrary to our thorough understanding of a situation, e.g. a sudden disappearance of a fatal and c

Right, I short-handed it. If an event occurred that is quite contrary to our thorough understanding of a situation, e.g. a sudden disappearance of a fatal and currently-incurable illness along with all traces of it, and this happens directly after the invocation of the intercession of a Saint in heaven, then it is theoretically possible that it's a coincidence and that we just don't understand further science behind it. But only someone who doesn't want to believe in the obvious and strong conclusion that it was a miracle is going to be able to. God designed it this way, so that it's not absolutely provable, but pretty much obvious to anyone with a good heart. I add this last clause because as Venerable Fulton Sheen said, the atheist half-believes in God by night, and nobody refuses to be Catholic except if its incompatible with the life they would rather live. Those who don't want to believe the truth don't have to, for "God sends upon them a strong delusion to make them believe what is false."