This isn’t really even a mainstrean evangelical thing. I think it’s more common in the Charismatic/Pentecostal churches.
Back when I used to listen to Proteestant Radio, there was a guy with a call-in show. I want to say it was Chuck Coleson, but I’m not too sure.
Anyway, one day this blind lady called in and said that she was tired of all the people in her church who told her that if she had more faith then she would be able to see.
“So you have a cane?”, the host asked.
“A cane? Yes, I use a cane,” she replied, the sound of confusion evident in her voice.
“Well next time someone says that to you,” the host said, “whack them with your cane and tell them that if they had more faith it wouldn’t smart.”
I thought it was great. Not necessarily the right thing to do, of course…