"For he that comes to Him must believe that He exists, and that He is a rewarder of those that deligently seek Him" para-phrased
You can't come to him except you believe that He exists or maybe you are willing to hazard this. But His existence is hinged on belief. That is, His existence to you.
The first thing (therefore) the scripture above shows is that God exists (to you) or does not exist (to you) when you either believe or do not believe.
God disappears when you stop believing. But there is a dynamic to this disappearance. He disappears when you come with a request that you do not see or get answers to.
This does not just happen immediately in most cases but it is something that gradually ebbs at the heart of belief when they repeatedly "ask without receiving". We are not looking at WHY they are not receiving but we are looking at how unbelief sets in.
Unbelief means God has stopped existing to the person that falls into it. Unbelief is a product of disappointment on the part of the person that falls into it. This is why unbelief tends to have real meaning to those who have already been exposed to the gospel rather than any other set of people. Look at the background of a man who has unbelief in God and there is every chance that you would find a time in that man's life when there was belief. But along the way, God stopped existing to that person and unbelief set in.
Therefore the effective weapon that can break the wall of unbelief is the coming alive of God in that person's life again. It is not God coming alive in their environment or in the life of someone around them but coming alive to them. Unbelief set in because of what they came to see as the silence of God. It crept in because of what they came to see as His unresponsiveness to them. Once the reverse of this silence or unresponsiveness begins to happen the hold of unbelief is broken.
Praying with Understanding
God breaking His silence or coming alive to them may not necessarily be on a matter of their own choosing or in something they had previously requested of Him. It may be just like in the case of Jonah when God made a plant to sprout one moment and then killed it and it triggered something in Jonah that opened the door for God to break through his heart. He did not break through his heart by destroying that city which was something Jonah had been requesting for.
If you know of someone being dragged into the bowels of unbelief your prayer of intercession should be that God should come alive again to that person. He should start existing again to that person. Once God does this, the hold of unbelief weakens and it can't but let go.
"Hope deferred maketh the heart sick"
Sick with what you might ask? Sick with unbelief is one of the replies. You might think that unbelief is "all on the person". That is, they brought it upon themselves and are the ones that control it as if unbelief is a human emotion or force. Well think again; unbelief is of the devil and when he speaks, he talks and sows unbelief.
"Did God say..."
"He was a ...from the beginning and when he speaks.."
Unbelief is ushered in and takes its place in the heart by the one who stands against all things godly. This is why unbelief usually takes to the heart of someone who had experienced belief at one time or the other.
The unheard cry of one bound to the chains of unbelief is that God might come alive. You can play a part in that with this understanding. God Bless.
One Word -emmanuel iweha