Believed to be constructed in AD 54, St. Thomas Church alias Mar Thoma Sleeha Church at Nilackal is one among the 7 and half churches founded by the Apostle Thomas.Also known as Arapally (half completed church), it was located on the eastern bank of the Pampa river close to the Sabarimala pilgrimage and the Nilackal temple originally. But the old church was completely destroyed and a new church was constructed on the thevar mala which is quite far away from the original site of the Nilackal Church. 

Mass timings 
Sunday -7.15am, 9:30am
Monday - Thursday -6.45am
Friday- 2.30pm-Rosary, 3pm Adoration,3.45pm-Novena of St. Thomas and Holy Mass
Contact Address: 
Mar Thoma Sleeha Curch
Nilackal, Thulappally P.O., Pathanmthitta Dist, Pin-686510
Phone: 04735- 244327.