Michelle:
Ballingarry RC parish has a gap in baptismal records from 1828-1849. If Thomas was born in the gap period and baptized in that parish, a record will not be available.
https://registers.nli.ie/parishes/0863
Do you have any info on his parents or possible siblings?
If you have not done so already, could you complete this form regarding your planned trip to Ireland? Thanks!
https://www.irelandxo.com/meet-and-greet
Roger McDonnell