I am a doctor. I am not an evangelical/charismatic, but I am a Christian.
I had my early training at a cancer hospital, and have had plenty of exposure to people and families at the end of life since then.
The very worst heresy, in my opinion, is to accuse the afflicted of lacking saving faith, to tell them, in effect, that if you were REALLY a follower of Our Lord that you wouldn't have cancer, or that your cancer would go away, and so on.
This is a direct contradiction of Matthew 5:45 and Luke 13:4. His ways are not our ways.
If I believed that illness (which is very common) and death (which is universal) falling on so many faithful Christians that I have cared for was a sign of unbelief or of judgement, I could not function.