James Reid sr. was a seaman, so a lot more mobile than most professions in 1848.
At least James Reid jr. was a farmer, a strange change from his father's profession, but likely to have remained in the same area after his marriage, although you neglected to say how soon he moved to Canada.
There were no less than 50 entries for various James Reids as occupiers in County Antrim in Griffith's Valuation, compiled around or shortly after the time of the marriage.
Could the groom's residence at the time of marriage, which looks like "Red Brays", be a variant of Red Bay, a townland in the parish of Layd, about ten miles along the coast north of the bride's residence in Carnlough?
Two of the James Reid listings in Griffith are in the parish of Layd, either of whom might be the 1848 groom (depending on his date of migration) or his father.
By the way, the only fire which destroyed Irish census records was in the Four Courts/Public Record Office complex, not in the Custom House, which is about a mile away.
I hoped that rootsireland.ie might have Presbyterian baptism records for Glenarm or Tickmacrevan, but it does not appear to - to see what is available there, select Antrim from the dropdown menu at:
http://www.rootsireland.ie/ifhf/generic.php?filename=sources.tpl&selectedMenu=sources
David M'Neill is a less common name, with only one in Antrim in Griffith, and he's in the townland of Townparks in the parish of Tickmacrevan, so well worth investigating.
https://www.nidirect.gov.uk/information-and-services/public-record-office-northern-ireland-proni/search-archives-online
has useful resources, including
* PRONI Historical Maps viewer
* Valuation Revision Books
etc.
