In Ireland there are civil records and church records.
Marriages usually, although not always, took place in the bride's church.
The following records are available at PRONI (and Coleraine Library):
Armoy Presbyterian Church: baptisms 1842-1906, marriages 1815-1920
Armoy Church of Ireland (Drumtullagh): baptisms 1826-1891, marriages 1827-1829, 1831-1910, 1913-1982, burials 1827-1893
Many Presbyterians are buried in Church of Ireland burying grounds but may not be recorded in the C.of I. burial registers. It's also possible that no headstones exist.