Hi - I came from a Charismatic background and I can say truthfully there are many flaws in the what I experienced of Charismatic theology mostly because of scriptures taken out of context.
Hagin - is a fraud - as are all of the word of faith movement. If you went to a false teacher who doesn't know God and then asked this fraud to "pray" to God for you. Of course God won't endorse such a man by moving on his behalf. These hucksters never tell you to get medical verification of their laying on of hands - just in case they get exposed as the frauds they in fact are.
No one has the gift of healing in the way the Apostles had BUT God does heal on a case by case basis of that I am sure.
I also know that God can decide to heal or not to heal according to his divine understanding and will.
The whole if you step out in "faith" - you will definitely receive healing is not Biblical. It is God's prerogative and prayer from a false teacher will always be rejected.
Paul had a thorn in the flesh which God didn't fix - what exactly the thorn in the flesh was is not clear. God simply stated that His grace was sufficient.
There is also a lot of pressure on a person to say that they have been healed whether or not it has happened because it is implied that if you didn't get healed you are somehow faithless. I know because I have seen this pressure tactic first hand.
Having said all this I know of two times God has miraculously healed. There is always a reason/purpose for the healing and the healing always imparts understanding about the character or nature of God. Once for me - a month after I got saved. The understanding I received was what unmerited forgiveness and unconditional love meant in practice. My ailment was because of my sinful lifestyle and a just punishment. My healing was medically verified shortly after the healing. My sinful drunkenness left my body in toxic shock - which manifested itself as severe food allergies and gastric problems, rashes, swelling and other symptoms.
On the other hand my dog suffered a completely crushed and shattered foreleg when she was attacked by a man with a steel bar and God healed her without any medical intervention. Again the lesson was to show me that God was merciful, kind and completely worthy of our fullest trust in Him - whatever situation I had in my life - God was actively involved and available.
There have been times when I have prayed alone and corporately and seen God answer.
There have been times I have prayed alone or corporately and not received what I asked for.
Things that help with prayer getting answered.
Tell God that you love Him and are grateful for your Salvation - whatever else happens you trust Him with your life and soul.
Understand that what you are asking for is granted out of God's unmerited mercy and providence. It is not because you are entitled to it.
Spend quality time in prayer and fellowship with God - don't just start prayer when a crisis comes along or God will use crisis after to spend time more time with you
An attitude of gratitude based on "you didn't deserve Salvation" but you were given it freely - You have been rescued from eternal torment in Hell and that alone is more than enough! Anything God does beyond salvation to you or gives you is for your betterment - even if you don't understand it or the circumstances seem to indicate the opposite by your understanding.
Be truthful with God, confess and forsake hidden sin. God while you are praying will always let you know what sin needs repenting with that soft heart felt voice.
Ask in a way that lets God know what you would like but submit to whatever God decides with humble gratitude.
Always assume that God has a better way of answering you prayer than you could think of and ask Him to intervene with what He thinks is the best way to resolve the situation. Give God room to work His will and show His Majesty.
If you don't get what you want DO NOT BE CHILDISH and threaten to walk away from Him - this is a sure sign that you did not know Him to begin with.
God resists the proud but gives grace to the humble.
I hope what follows helps you determine for yourself what scriptures are used rightly or not by Charismatics.
Also most of Charismatic error in theology is because they take scripture out of context.
Context being who is God talking about or too (Jews, Christian's, Sinners or everyone). Charismatics like to claim a lot of the promises God made exclusively to the Jews for themselves.
The Bible finishes talking about a subject, application or to a particular class of people before it changes to another subject, application or class of people. It doesn't jump back and forth mixing subjects applications or the people it talking to or about - so every verse has the same subject, application and is for a particular class of people until a new context is given and it doesn't jump back and forth.
This is the simplest way to determine exactly whether or not a scripture is being used correctly.