Looking for Thomas McBride who married Catherine Boyle in Ballyeaston about 1825

Julie,

Statutory marriage registration (Vital Records) started in Ireland in 1845 for non RC marriages and 1864 for RC marriages. Prior to those years you need to search church records. Not all churches have records for that period and of the records that do exist, not all are on-line.  You haven’t said what denomination this couple were, but there are the following marriage records in the Ballyeaston area:

1st Ballyeaston Presbyterian records start 1815

2nd Ballyeaston Presbyterian - 1826

Church of Ireland - no records for that era (they were destroyed in the 1922 fire in Dublin)

Roman Catholic 1821.

There are copies of both the Presbyterian records in PRONI (the public record office) in Belfast. A personal visit is required to view them. The RC parish records (parish of Carrickfergus, Larne & Ballygowan) are on-line free on the National Library site:

https://www.nli.ie/en/family-history-introduction.aspx