One of the faithful is a term that can be used to describe someone who is a BELIEVER, FAN, or ADORER. A BELIEVER is someone who has faith in something, such as a religion, philosophy, or set of values. A FAN is someone who is enthusiastic and devoted to a particular person, team, or activity. An ADORER is someone who loves and admires someone or something deeply. All three terms can be used to describe someone who is loyal and devoted to a particular cause.