When you come to really believe something, your entire heart buys into that belief. If there are any obstacles to believing something, they need to be impartially looked at, and properly addressed. If the object of your faith is truly trustworthy, and your doubts are removed in a way in which you personally believe, then you enter into a realm of faith where “everything is possible”. Literally, everything is a fluctuating field of quantum possibilities, waiting for you, the observer and the influencer, to enmesh your heart-level beliefs with it. That will invariably produce the intended result.
A subtle yet deadly enemy of faith is mind-level indoctrination. In Western churches, we are often offered a very superficial set of teachings (“doctrines”) to which we are required to intellectually assent. The payoffs of that superficial agreement to a set of metaphysical propositions are: a sense of social belonging with the group, a promise of getting on the good side of God, and avoiding immeasurable pain in the afterlife.