disciple vs true believer

disciple

noun
  • An active follower or adherent of someone, or some philosophy etc. 

  • A person who learns from another, especially one who then teaches others. 

  • A wretched, miserable-looking man. 

verb
  • To routinely counsel (one's peer or junior) one-on-one in their discipleship of Christ, as a fellow affirmed disciple. 

  • To convert (a person) into a disciple. 

  • To train, educate, teach. 

true believer

noun
  • A strict follower of a doctrine. 

  • One who believes dogmatically in something regardless of evidence or even conclusive proof that the thing is false or was staged; one who has true-believer syndrome. 

  • Used other than figuratively or idiomatically: see true, believer. 

How often have the words disciple and true believer occurred in a corpus of books? (source: Google Ngram Viewer )