Could you please post your message here (Belfast city): http://www.irelandxo.com/group/shankill-down and here (Craigavad): http://www.irelandxo.com/group/holywood-down and here (Bangor): http://www.irelandxo.com/group/bangor-down
You might find this a useful link for information about Presbyterian records in Ireland: http://www.irish-genealogy-toolkit.com/ancestral-records.html
Civil registration records are available from the General Register Office (GRO). These start from 1864 however. You can access the website here: http://www.groireland.ie/research.htm
You could also try checking the land records called the Tithe Applotment Books (1823-38) or the later Griffth's Valuation (1848-64). Griffith's is freely available here: www.askaboutireland.com or here: www.failteromhat.com Failte Romhat has lots of other useful links you could try looking at.
There are some books you might be interested in looking at. There is one by Edward D. Atkinson, called Dromore, an Ulster Diocese, Dundalk: W. Tempest, 1925. This is available at the National Library of Ireland, Ir. 274116 a 1.
Also: by J. A. Lamont, Presbyterianism in Holywood: Bangor Road Congregation, Bangor: 1967, NLI.
Please make sure you link anyone else in your family who is interested in their Irish heritage to our site - and indeed anyone else you know of Irish heritage.
Genealogist (Ireland XO)