The largest Church in Mainland Asia, is Sumi Baptist Churchin Dimapur, Nagaland State, East India. Nagaland is one of the only 3 Christian majority states in India, the other 2 being Meghalaya and Mizoram.
It is interesting because of the unique architecture of the building, which is quite an impressive structure.
This video consists of an interview with the architect, a very talented local Nagaland lady, (not the Senior Pastor of the church as she is incorrectly labelled in the video). It also has footage of the interior of the building.