Faith is a substantive intellectual and emotional state, in which a person deeply believes in communion with the unseen Creator of the universe. There is no mystery here. His name as a human being is Jesus Christ.
Faith is an act of willingly, willfully receiving all God gives.
Faith is the response of a human which brings the supernatural reality of the Kingdom of God to the Earth, one little human at a time.
I believe healthy believer groups assist individuals in two ways to develop faith:
uphold an ever sharpened view and sense of the holiness of God
uphold the believer with huge depths of compassion and patience.