Hi Geroge, thanks for giving a message. You can search following keywords added with curuch, christinity or similar words, you can find nemorous resources in http://books.google.com/
Chogans, chegos, ezhavas, siegos, silgos, tifedoors, tiyyas, ilava, izhava, izhuva, ezhuva, cekon, covan, tandan, channan, channar, Tiyan, thiyya, izhavan, Izhuvan, illavar, illavan, illava, illuvar , illuvan, illuva
In following book, please read para 3
The specific content you are referring to is taken a book on narayana guru by Sathya Bai Sivadas & P. Prabhakara Rao
you can find the some details from the following link (its an article sourced from the authors book)
http://www.narayanaguru.org/vaikkom.html
you can also refer to a book given below where you have separate section called Izhava Christian
People of India : Kerala : Volume XXVII/edited by T. Madhava Menon, Deepak Tyagi and B. Francis Kulirani. https://www.vedamsbooks.com/no28259.htm
regards Dayaanjali
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