Jethro my friend, I have witnessed good solid believers who, in a time of great grief and loss of health, say things about or too God that they really don't mean. Some who have prayed for healing over and over for themselves of a mate, get so disappointed and mad at God that they say, think and act like they just want to walk away from Jesus. When my Wife of 33 years died of cancer, that night I looked out of my bedroom window, looked up at the dark sky and said to God, "what the hell are you doing." I was very upset and angry that He did not heal my Partner in the ministry. I didn't give up on Jesus but came close.
I call the Holy Spirit, "the hound of heaven" Just look at the Disciples, Peter did what you are talking about but the Holy Spirit didn't let him get away. Don't under estimate the power of God thru His Spirit. There is no human who can determine how and to what extent what He can do. Lets not limit the power of God to keep those who have committed their lives to His Son thru the efforts and drawing to Jesus for salvation, and to think that man can undo what God has done, please!
I have not seen one time God fail anyone who believed him. We can't be moved by past tragedies, and there is no such thing as a solid believer who gets disappointed at God.
Faith, already knows the outcome. Unbelief gets disappointed from the outcome.
We prayed over and must not have been God's will to help. Jesus said when you pray believe you receive then you have the answer. Mark 11:24 the only reason someone wants to pray over and over is because it could be God was not paying attention the first time. Oh my....
It is written, if we ask anything according to his will, then we have confidence that he heard us, and if we know he heard us we have the petitions desired of him. If we need healed, we best get his will settled on it.
We don't go against the word and expect results. Even the best ministers in the land, given direct power by the Lord of Lord's himself, Jesus our king, to cast out DEVILS could not cast out the devil from the boy who threw himself in the fire. The best in the earth had failed.
They start some doctrine that God does not always come through? Write a book that God sometimes does not want to heal and we just don't understand his mysterious ways?,
No, they ask why could we not cast him out. They had enough sense to know they were the issue. Jesus said because of your unbelief.
Latter on though, we see Peter at gate beautiful grab a man's hand saying rise and walk in the name of Jesus, nothing doubting. The same Peter that denied knowing the Lord, out of fear, goes to sleep in a prison knowing they were chopping his head off the next morning. Not a care in the world.
We fall short. It's never God not wanting to help. We never receive from God according to his ability, but what we can believe. Just like the disciples though, we can take responsibility for our failures and get help to be stronger, a force on earth the devil even dreads us waking up in the morning.
I have been there, my own brother in the Lord waiting on the ambulance claiming a heart attack. The other strong brothers praying for him, to no avail in our prison wing, so they come wake me up. Nothing I could do, but I had learned some things. I went to the Lord, I said Lord, my brother dies possibly if I can't get him in agreement with me and you about his healing. I know it's not your will that he thinks he is dying and waiting on the ambulance.
Getting wisdom on something fixes things instead of just praying over and over about something. Wisdom is the principle thing, therefore get wisdom and understanding. I go off then praying in tongues, and the stupid devil attacks me twice. Still have the scar on my nose, from the first attempt. There will always be resistance, and physical evidence from the devil that God is not going to help. Persecution for the word sake. The Lord then spoke to me, blood dripping down my face.. "go to your brother, hold his hand and have him just thank me for what I have done in his life"
Ummm, did not seem much like a solution, at the time I was clueless about the power of praise. So I did, and the power of God ran through both of us, healed instantly. I still made him go with the ambulance to get checked out.
It's always us that falls short. Never God, and never a reason to get upset at God because he is our help.
You can always go back to someone that was not healed and the Lord will bring to your remembrance where it was their statements of unbelief as to why. As I told my wife, who was having serious medical issues and schedule surgery in hopes to save her. You know enough now that God never fails, you best get in Faith, your responsible for what you know. Praise God she did, she even canceled the surgery and told the devil enough!!