[Stingy Jack]

Well ... if that story is true (and yes, I am very skeptical), then anyone who prays needs to rethink the whole "everything that happens is in God's plan" thing. I mean, if she got cancer, it was in God's plan. So ... if she didn't pray, does that mean the cancer would have killed her? Would not have gone away on its own, like you claim? Or, did her prayer convince God to change his mind about the whole thing?

God: "Well, she seems nice. I guess I've tortured her and her family enough. Begone, cancer!"

Also, it seems to me that God wouldn't perform "miracles" like this. You could argue: "He answered her prayer to strengthen her faith." Sounds like she was already pretty faithful (refused treatment based on her faith) ... why not answer the prayers of people whose faith is wavering? Then you could say: "He answered her prayer to strengthen the faith of the doctor and everyone else who witnessed this." But, wouldn't that be sort of like God providing evidence of his existence? I thought that in order to have true faith you had to believe without any evidence.
I mean ... faith is blind belief. Belief without any rational reason or evidence to support it. I mean, if you had evidence, then it wouldn't be faith. It would be belief based on something.

So, I'm sure that there is a natural explanation for what happened to your grandma. If that story is true. I mean, we don't everything yet, and are particularly ignorant when it comes to the human brain. I am sure the brain has natural powers over the body that we haven't even considered yet.