The Church Missionary Society began work in this area in 1848 and Rev. Henry Baker Junior came as the first missionary. He is now remembered as "The Apostle of the Hills". He taught Christian faith, doctrines to the community and helped them to liberate the clutches of exploitation of others communities. He began baptizing elders in the year 1848 and started the first church at Erumapara. Rev. Michael John was one of the pastors from Melukavu area, was appointed as the special officer for the formation of a new Diocese. He traveled far and wide and made consensus among the people and prepared them to form the Diocese. The 18th, session of the C.S.I. Synod decided to bifurcate the Diocese of Madhya Kerala and to form a new Diocese under the name 'The East Kerala Diocese',East Kerala Diocese was formed on Easter Sunday, 3 April 1983. Melukavu Christ Church became the Cathedral of the newly formed Diocese.