It is indeed awful if people are being told that their lack of healing is their fault. A fallacy, and something I am deeply concerned about, although thankfully churches are seeming more enlightened and I see less of this now (have experienced it myself, sadly, suffering from a chronic disease.)
People get it wrong. But that doesn't mean God doesn't heal. He does, sometimes. I'm just back from a conference and have talked to people who have been, quite dramatically. You can say I am making it up. You can say they are making it up. All these things, I know you will be sceptical. Because I would be too. I can see it looks like so much bunkum, I really can. But I have seen it, I have experienced it personally, and other times I have not. But my faith remains because I experience a God who loves and is so captivating and so present.
I know you all think I'm a nutter. And happy to be thought of as such, I suppose. As long as it's a fairly fluffy nutter. But I couldn't come home from this amazing time I have had and not comment on this thread, because that would be wrong of me, I think.
I can't provide the proof you want. I can tell you stories, but I haven't got youtube links and doctors reports (although I am aware there are such in circulation - however, I would be worried about the authenticity of youtube videos of healing - as in the Derren Brown stuff etc.)
So I am well aware of the scams. Oh yes, and it makes me mad that people exercise this kind of power over others. It's not a God thing in any sense whatsoever. What is a God thing is the healing of a friend with a damaged spine. And somehow God is also in the non healing of me, not in the sense that God wills this but that God is in it with me. It's a mystery to which I both testify and remain convinced and blown away.