Fasting and long hours of prayer do not build faith. Reading books about faith and men of faith and their exploits stirs in the heart a deep passion for faith, but does not build faith.
The Word alone is the source of faith. You cannot build one up spiritually on philosophies or theories about the word, or on the history of the word. We are only made spiritual by living in the Word and by the Word living in us. Faith cannot be built, except upon the Word of God.
Remember to attend midweek service onsite or online depending on the city where you live. God bless you richly!