Get in touch with your spiritual side and meet other worshippers at St. Marys Church. Explore outside for a few moments or ask if you're allowed to join the next service.
You're spoiled for sightseeing choice when staying in Secunderabad. St. Mary's Church is a great place to begin here, but there are lots of other fine places to experience. Charminar, Birla Mandir Temple, and Chowmahalla Palace are close to the house of prayer and will fill in your day nicely.