I've been putting together an answer to my own question What is an overview of conditional Biblical promises for truth seekers that can be empirically tested in their lifetime?. While doing this exercise, I realized that many of the conditional promises in the Bible depend very strongly on the individual's faith. The one that stresses this point most clearly is the promise of wisdom in James 1:5-8:
The promise of wisdom, to those who ask for it in faith.
5 If any of you lacks wisdom, let him ask God, who gives generously to all without reproach, and it will be given him. 6 But let him ask in faith, with no doubting, for the one who doubts is like a wave of the sea that is driven and tossed by the wind. 7 For that person must not suppose that he will receive anything from the Lord; 8 he is a double-minded man, unstable in all his ways. [James 1:5-8, ESV]
James couldn't have been more clear and emphatic: if you don't have faith, forget about receiving anything from God. Period. Unfortunately, this can be quite disheartening for someone who yearns to enjoy God's promises but lacks at the same time the faith that is necessary to actualize them in their own life. Fortunately, hope shouldn't be lost, since there are other promises that are specifically aimed to increase a person's faith. The one I want to bring the reader's attention to is the following:
The promise of faith, to those who pray and fast. And the promise of miracles, to those who have (enough) faith.
20 He said to them, “Because of your little faith. For truly, I say to you, if you have faith like a grain of mustard seed, you will say to this mountain, ‘Move from here to there,’ and it will move, and nothing will be impossible for you.” 21 But this kind never comes out except by prayer and fasting [Matthew 17:20-21, ESV]
I personally believe this promise is very powerful. It not only promises that a person can significantly boost their faith through prayer and fasting, but also that they might even possibly attain a miracle-working faith, a faith that can move God to do anything for them (within the boundaries of God's will, of course). And there is even more: with such a level of faith, all the other promises that have faith as a necessary condition should just unfold naturally, like a ripple effect. In other words, someone with this level of faith should be able to enjoy all of God's promises.
Question: Do any Christian groups or denominations believe that miracle-working faith can be attained through prayer and fasting, thus enabling the believer to enjoy all of God's promises that have faith as a necessary condition?