Faith, the basis for religion, is subjected to the power of suggestion. Debating the existence of God, for example, assumes the existance of God, and draws people to fight for whichever belief is the most emotionally satisfying and in touch with their own lives. If any religious person made it a habit to stand in the mirror everyday, confridently and loudly affirming to themselves "God doesn't exist" and "the Bible is a lie", chose to only read articles that provided rational evidence for the nonexistence of God, and desecrating sacred objects such as the Bible, they will eventually reject their faith because simply suggesting that God doesn't exist on a level that is credible and a level and targets emotional factors within themselves that cause them to reject God.
The opposite is also true. If someone who is athiest prays to God everyday, goes to chruch for guidance, listens to christian music, and visually, auditorially, and kienestically subject themselves their that faith, his emotions will reorient themselves to join the faith. Using common mediums of exchange to communicate these ideas and create a consistent framework around one's mind creates a new faith.