Since marriage seems to be 1853 it's not surprising Registrar couldn't find it. There are quite a few Protestant churches in Dervock/Ballymoney area. Some of the records for churches in Ballymoney area are on microfilm at Coleraine Library: Armoy Church of Ireland, Armoy Presbyterian, Dervock Presbyterian Church, Dunloy Presbyterian Church, Garryduff Presbyterian Church, Drumreagh Presbyterian Church, Dunaghy Church of Ireland, Killagan Church of Ireland, Kilraughts Reformed Presbyterian Church, Loughguile Church of Ireland, Mosside Presbyterian Church, Rasharkin Presbyterian Church, Toberdoney Presbyterian Church, Toberkeigh Presbyterian Church.