My understanding (for examples of healing) is doctors and specialists have made thorough examinations before and after such an event, and they pronounced the patient healed, without identifying a cause initiated by them. The explanation for this may or may not be faith based, but in relevant cases, the patient claims to have prayed for healing and believes her prayer was answered.
I have not indicated any other means to assess such events.
I suggest your understanding of faith may be different to mine. I would agree with this however; if anyone wishes to convince others of faith by performing parlour tricks, I would regard such as a fraud or worse. Faith is predicated on freedom and the uninhibited intellectual questioning.
I am unaware of a scientific method to assess miracles - if that is what you seek, This has nothing to do with challenging anyone's belief, and miracles, as shown in the Gospels, are prone to cause all sorts of responses from people - nor are miracles meant to provide an alternate explanation, so I guess we end up with little in the way of science. I think the only person who would have a meaningful opinion would be the recipient of a miracle. The rest of us may talk and talk....