redemption vs saving grace

redemption

noun
  • Salvation from sin. 

  • The act of redeeming or something redeemed. 

  • The recovery, for a fee, of a pawned article. 

  • Rescue upon payment of a ransom. 

saving grace

noun
  • God's grace or blessing, enabling sinners to attain salvation. 

  • A redeeming quality or factor. 

How often have the words redemption and saving grace occurred in a corpus of books? (source: Google Ngram Viewer )