Orthodox Christianity vs Orthodoxy

Orthodox Christianity

name

  • The religion of Orthodox Christians. 

Orthodoxy

name

  • The beliefs and practices of Orthodox Judaism. 

  • The aggregate of the definitive elements of the Eastern Orthodox Church, such as its faith, worship, theology, and traditions. 

  • The Eastern Orthodox Church. 

How often have the words Orthodox Christianity and Orthodoxy occurred in a corpus of books? (source: Google Ngram Viewer )