I have heard that faith can be many things, but what I have been shown in the Word of God is very simple. Faith comes by hearing from the Lord.
When the Lord speaks to us from within the Holy Bible He tells us the end, but does not tell us what the journey will be. It is in the journey that the Lord tests our faith in what He has promised us at “the end.”
An example of this is when the nation of Israel left Egypt. He told them He would take them to a land flowing with milk and honey. He did not tell them about the very long journey through the desert (even going in circles to teach them) and what that will require of them. Most people give up on the promises of God because they do not like the way of God’s journey for their faith. But, without the journey our faith in His promises will mean very little to us, and to others we share it with.