There is a Catholic church in the west gate of the University of Hong Kong. It is within walking distance (Xibao City-Shandao-Baode Street).

If you don't want to leave, please take the green minibus 13. There is a minibus stop in front of McDonald's on Smythe Road. Tell the driver to get off at church.

I recommend you to go to St. John's Cathedral in Garden Road, Central. You get off at Chater Garden by the sea and walk along Garden Road for a few minutes. This is a cathedral, you can visit it for free. The capital of Kent is the seat of the church.

If you don't know the route, just look at the map of Central Plains.