Graeme,
Tradition was to marry in the bride’s church so you would certainly expect Isabella Marshall to be connected to the church where she married. Rev Thos Dix Hincks was ordained as a Presbyterian Minister but, according to the Dictionary of National Biography, in 1835 he was teaching at Belfast Royal Academy, so he probably wasn’t the normal officiating Minister at the church. Perhaps he was a family friend, and was specially asked to conduct the service? This might account for his officiating.
https://en.wikisource.org/wiki/Hincks,_Thomas_Dix_(DNB00)
His son Thomas would only have been about 17 in 1835 and hadn’t been ordained, so I doubt he was the Minister who officiated.
Newtownbreda Presbyterian only seems to have records from 1845 onwards so that may fit with it being established in 1840 or thereabouts. There is another Presbyterian church nearby at Gilnahirk, with baptisms from 1797 and marriages from 1828. It might be worth looking at those records.
I’d be inclined to check with the Presbyterian Historical Society (PHS) to see if they have any information on whether Newtownbreda congregation existed in 1835. They may also be able to give you some information on the Rev Hincks as they keep career information on all Presbyterian Ministers, in a book known as FASTI.
http://www.presbyterianhistoryireland.com
PRONI has a copy of most of the surviving Presbyterian church records (with dates), but they are not on-line and a personal visit is required to view them. If you are unable to go there yourself, you may need to employ a researcher.
http://www.proni.gov.uk/guide_to_church_records.pdf
Researchers in the PRONI area: http://sgni.net
PHS also has a copy but they don’t do look ups. A personal visit is again required to view them.
Don’t expect too much information from a pre 1845 marriage. Usually all the record contains is the couples names, the date of the ceremony and the 2 witnesses names. Sometimes you get a townland (address) or occupation but often not. Rarely are father’s names given and a mother’s name is very rare indeed.
The marriage is most unlikely to have been Methodist, both because the Minister was apparently Presbyterian and also because Methodists had only just started conducting their own marriages in Ireland in 1835 and I only know of one church with a Methodist Minister in the Belfast area then which conducted marriages. (In the 1830s, most Methodists still used the Church of Ireland for their marriages).
