New Delhi, Aug. 4 -- It is like any other church in Nigeria 's megacity of Lagos. A lectern faces rows of plastic chairs. A biblical quote is written on a beam above. There is a music section, with a set of drums. Sash-wearing church wardens move around to enforce order.

But it is also different. For hours, the only sounds are exclamations and thunderous bursts of drums, with their vibrations the cues for when to pray, kneel or respond to the preacher's calls for "Hallelujah."

This is a church for deaf people in Somolu, a mixed-income suburb, where about 50 to 60 people worship weekly.

Imoh Udoka, a father of two children, has attended the church for 36 years. He was 9 years old when he contracted meningitis, losing his hearing as well...