illegality vs mortal sin

illegality

noun
  • a defense to the validity of a contract because it was in violation of the law 

  • the state of being illegal 

mortal sin

noun
  • A sin which causes the loss of God's grace, leading to eternal damnation, unless the sinner repents, which includes their intent to confess and atone; such a sin is defined as a transgression against one of the Ten Commandments with the full knowledge and deliberate consent of the sinner. 

How often have the words illegality and mortal sin occurred in a corpus of books? (source: Google Ngram Viewer )