Drumintin townland is located about 6km (~4 miles) north of the town of Cootehill Co. Cavan, and about the same distance west of Rockcorry - see the entry on the placename database (Logainm.ie), and attached Google map.
There's a townland named Kilcrow in Ematris civil parish, it's located just south of Dumintin but the historic OSI maps show that 'Kilcrow Church' is actually the one in the adjacent Dawson Grove Demesne. The church is not visible from the road but is shown on Google Satellite view.
The townlands of Dawson Grove, Kilcrow and Dumintin are all very close to each other - see attached map diagram based on the placename database details.
The church now seems to be referred to as 'Ematris St John E (Dartry)' - Dartry is the later name for the house at Dawson Grove.
There's no Saint's name mentioned for the church on the c1840s map, but the later map c1890 show it as St. John's. The historic maps show a small graveyard attached to the Church at Dawson Grove, so likely that's where Thomas was buried. Baptism, Marriage records for Ematris Church of Ireland parish go back to 1766, burial records to 1811, and are held by the Representative Church Body Library in south county Dublin. Some transcripts for this parish are also available on RootsIreland (pay-website)