I've seen things like that before. Just go to a church (not a bad church, but a good church, although sometimes it can be a bit hard to find one nowadays) Heck, lately at my church sometimes you see people drop left and right, as a matter of fact I myself was once in that position. I went through a lot, most of it wasn't really PG rated. Sometimes God speaks through people and I know it because he when he speaks to people through others, you know it's to you because he accurately describes your situation and sometimes others' at the same time. I know people who have regrown toes, stood on thin air when they weren't paying attention while walking, and gotten out of situations normally people wouldn't be able to get out of.
I know it sounds like a load of bullcrap but when it happens you will know it.
And when it does, and that isn't proof enough, then I really don't know how you would ever be convinced.