Dear Kevin,
Sorry for not replying sooner, but I have had hardrive problems for the past 5 months, so fingers crossed. The main issue is trying to find details of people prior to civil registration and you are lucky to have your family in 1821 Census as only parts of that Census survives. The trick is to find people that survived after 1864, which would take you within Civil registration. I will list out below the various sites that may help you further in your quest.
I don't know if you have looked at the following free records, though while all the images are not available online you can order copies and you will find them at www.irishgenealogy.ie this is what is held at the General Register Office (GRO) and includes all official records of Irish births, deaths and marriages from 1864 and of non-Catholic marriages from 1845, the historic indexes of which can be viewed and in these cases you are trying to bring your family within civl registration.
Elsewhere:
1. www.rootsireland.ie: This paying site has transcripts (without record-images) of most of the Roman Catholic records on the island of Ireland for areas other than those listed above. The major exceptions, where only small proportions of the records are transcribed, are counties Donegal, Monaghan and Wexford. None of the transcribed records for Clare are online. Each geographical area on the site has a "sources list" and it is essential to consult this in order to ascertain precisely what records are being searched. The site also includes transcripts of Church of Ireland, Methodist and Presbyterian registers, complete for some counties, completely absent for others.
2. www.familysearch.org: This free site run by the Church of Jesus Christ of Latter-day Saints (LDS) has transcripts, without record-images, of approximately thirty Roman Catholic parishes, mostly in counties Kerry, Cork and Roscommon.
3. www.ancestry.co.uk: This subscription site has transcripts, without record-images, of the registers of the diocese of Meath up to 1880, approximately forty parishes, as well as a copy of the LDS transcripts.
CHURCH RECORDS ARE AVAILABLE FOR RESEARCH OFFLINE
1. The National Library of Ireland has microfilm copies of almost all pre-1880 Roman Catholic parish registers on the island of Ireland. Access is free and print-outs of the records are allowed. See www.nli.ie.
2. The LDS Family History Library has microfilm copies of c. 40% of Irish Roman Catholic parish registers, some copies of National Library of Ireland films, others filmed by the LDS themselves. See https://familysearch.org/catalog-search. These films can be ordered via the Family History Centers attached to most Mormon temples.
3. Most local Roman Catholic parishes do not permit research on their original records. Callers will normally be referred to the heritage centres whose records are now almost all on www.rootsireland.ie. If necessary, contact details for local parishes can be found via www.catholicireland.net.
4. The Representative Church Body Library is the official archive of record for Church of Ireland records that survived the burning of the Public Record Office in 1922. A full list of its holdings is at http://ireland.anglican.org. All are freely searchable if they are not too fragile to be handled.
5. The Public Record Office of Northern Ireland (www.proni.gov.uk) has freely available microfilm copies of almost all surviving records of all denominations for areas now in Northern Ireland, as well as a good number for areas in the border counties of Donegal, Cavan, Leitrim, Monaghan and Louth. A full list is at http://www.proni.gov.uk/index/search_the_archives/online_indexes/church_of_ireland_index.htm.
6. Quaker records are very comprehensive back to the 17th century, with microfilm copies in NLI and PRONI. See www.quakers-in-ireland.ie.
7. Some Presbyterian records are only available locally or in the Presbyterian Historical Society. See www.presbyterianhistoryireland.com.
Also available for free at http://www.genealogy.nationalarchives.ie/
