According to Genesis 15 faith is the willingness/ability to overlook our current situations or circumstances and instead to believe in what God is saying about us.
Abraham was able to believe What God said about him that his descendants would be as many as the uncountable stars even when he had no son or even children
How do we become people of faith?
By counting on the faithfulness of God in our lives, the same God that enabled us to accomplish certain things in the past is still the same one who will enable us to overcome our current circumstances and situations.