graveyard attached
You are perhaps misinterpreting. Yes up until 1782 it was illegal for Presbyterian ministers to conduct marriages, but there followed a hazy area as it was only with the start of Civil registration 1845 that it was clearly stated that they were legally recognised. Many did marry in the Presbyterian church say in the 1820's, but if there was a dispute they could be considered invalid. That did not apply to baptisms. A child is legitimised by virtue of parents marriage, not by baptism.
See right hand column on
https://www.irish-genealogy-toolkit.com/ancestral-records.htmlIf you refer to the Ros Davies church link you will see that the present Drumballyroney Church of Ireland, St. John's, was built in the year 1780. However the PRONI guide only shows microfilm coverage from 1838. The the Church of Ireland's own guide says baptism, marriage and burial registers exist from 1831 (No colour) = Parishes the records of which records remain in local custody with some coverage on RootsIreland; as listed in their source link (above).
https://www.ireland.anglican.org/cmsfiles/pdf/AboutUs/library/registers/ParishRegisters/PARISHREGISTERS.pdfPRONI does not have burial info for Ballyroney Presby and the Presbyterian Historical Society direct researchers primarilly to there; they do not hold any for Ballyroney. RootsIreland has burial transcriptions form 1865.
"As very few Presbyterian churches had or have a graveyard attached, the practice of recording burials was not widespread and the number of registers recording these details are few." Few Presbyterian congregations have very old burial registers (to Congregational Records).
Burial records are generally very uninformative, be they Presbyterian or C of I, up to the 1850's, often they just say Mary Little buried 1 Aug 1825 with no age and so no way of knowing if was a child, mother, or grandmother.
"Burial registers can be fairly uninformative, with the name of the deceased, the date of burial and occasionally the occupation and age at death given."
https://www.presbyterianhistoryireland.com/collections/library/guide-to-congregational-records/
