Christians: What happens when you pray for a sick person to get well?

Does God make people sick, then wait to see how many people are opposed to it to see if he should make the person well? Does God decide that it's time for someone to die, then change his mind if the right person (or the right number of people) ask him not to? What if someone really, really doesn't want... show more Does God make people sick, then wait to see how many people are opposed to it to see if he should make the person well? Does God decide that it's time for someone to die, then change his mind if the right person (or the right number of people) ask him not to? What if someone really, really doesn't want the person to die but never utters it as a formal prayer?

Bottom line, does God change his mind depending on the muttered words of humans? Or does petitionary prayer change nothing?
Update: David N: But most people don't pray that way. What you're describing isn't petitionary prayer. Most people pray to ask a deity to do what the person wants.
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