Geeze man, religious whack jobs eh 
Eh? Not sure what your point is. Prayer doesn't hurt, and if billions of believers on this planet are correct in their faith, it might actually help a little. Not sure how that makes people who are willing to pray for someone else's welfare "whack jobs"... They do seem to be taking the person's condition more seriously than you are and are at least doing *something* to try to help... Is that what makes them whack jobs, that they are trying to help someone in the only way they can, by praying for them?

Honestly, I don't understand the point you're trying to make. Are you disagreeing with the entire concept of people helping one another, or just criticizing this one person's specific prayer? Or are you really supporting the effort and trying to be sarcastic about non-religious people who call religious people whack jobs?
If you're just criticizing this one person's prayer, you can be assured that most people in the world would answer your critique with a hearty STFU and a suggestion you either go **** yourself, or pitch in and help out instead of being nasty about the whole thing.

As for my own opinion about the power of prayer and specifically that one prayer you quoted, it does seem a bit silly to command god in the name of Jesus to get rid of someone's cancer. But since I don't have anything to offer, why should I crap on someone else's good intentions just because I personally don't think their approach will be effective? It certainly will do no harm, so I use my "inside voice" instead of my "outside voice" for any critique of their efforts...