The Technique of the preacher knowing about sick people in the crowd is an age old cheating method. The Preacher uses his intelligence personal to gather info about the Sick persons in the crowd, before the meeting, and would call out names during the preaching. This is done worldwide by most of the Christian preachers.
As titch said, can an amputee get his organ back in the healing process? NO.
Can terminally sick people be cured? NO
My friend who was a pastor recently died of a sudden cardiac arrest. He was only 52 and had 2 school going children. He preached about Jesus all the time and was very sincere. How about this.
Of course I appreciate the good things Christianity has done. Schools and hospitals and Home for the aged and Destitute.
But it does these Pseudo Scientific and Fraudulent preaching methods also.