There will always be unanswered questions. There will also be answers that test our understanding. It is not usually our faith that is tested but often our perspective is questioned. Say I reckoned the earth is flat, well satellites or orbiting flights would bring that notion into question. At one time it was reckoned that the earth was the centre of the universe, and before that that the earth was the sky was the entire universe. Anyway God does not give answers. Those you have to search out for yourself.
Faith is built on knowledge. Some people carry a St Christopher medallion so that they are protected by that saint when they travel. They may even pray to him for protection. Say two people. both of whom are apprehensive, one researches into the science of flight, aeroplane construction, pilot training, flight routine and procedures. Much of what he is told goes over his head, but he understands that safety is a high priority. The other one buys a St Christoper medallion. But who is the wiser traveller? The one with the St Christopher medallion, or one who has knowledge of flights and aircraft etc. Which one is relying on faith, and which one on superstition?
So to gain faith in God, you have to have knowledge of God. Knowledge of God cannot be imagined. It has to be sought from those to whom God has revealed it. That is where the bible comes in. The Bible we have is a translation, and so we need instruction from those with better knowledge than we have.
Faith goes beyond knowledge. Faith sees a vision of what is not yet. Faith sees possibilities. Seeing these possibilities is what we call hope. These possibilities that we see are in accordance with what God has promised. There is a danger in leaning on our own understanding. So if we can set our focus on the promises of God, so that we rely on God to fulfill them and resist the natural inclination to be strong for God. Then we can walk as His true servants.