Nilackal is a forest, almost 52 kilometres east to Ranni and near Sabarimala. It was a mountain route of trade between Kerala and Tamil Nadu. Saint Thomas accompanied by habban came over here prached good news and baptised 1100 people. Today there exist the Nilackal St. Thomas Church, Ecumenical center trust and the cross established by Saint Thomas the apostle.
Saint Thomas who was an apostle of Jesus Christ established seven and half churches in India and was called as Seven and Half Churches or Ezharappallikal. One of these churches is the St.Thomas Ecumenical Church at Nilackal. This church is an example of the unity of the Christian churches and also of the communal harmony. The church trust proved that unity among the churches can be maintained and at the same time give respect to the sentiments of the faiths of other religions. The main message which the church provides is of love, peace and fraternity.
The church was constructed in the year AD 54. This church has the importance that it is the first Ecumenical church in the world and is has been dedicated by all the denominations as an example of heritage by St. Thomas. The Nilackal church is located in the interior part of the Sabarimala hills, while all the other churches built by St. Thomas are near to the coastal areas. Even though there is no historical evidence of the missionary work of St.Thomas in Nilackal, some assumptions of St. Thomas’s establishment of a church in this place is written in old metal plates and other historian writings. Since the old church is in a dilapidated stage, a new church has been constructed in a site not far from it.