Lutheranist vs Lutherist

Lutheranist

noun

  • A Lutheran. 

adj

  • Lutheran; promoting Lutheranism 

Lutherist

noun

  • A Lutheran; a proponent of Lutheranism. 

  • A scholar who studies Luther or his works. 

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