Nicky,
Without some record of John?s father?s name, you are really guessing who he is.
The civil marriage certificate would normally give a lot more information than is contained in an RC marriage certificate. Generally in the 1800s on an RC marriage cert, all you get is the couples names and their 2 witnesses, whereas the accompanying civil certificate contains occupations, addresses, the couples previous marital statuses, father?s names and occupations. (If you have seen an English marriage certificate then, an Irish one from the 1870s was exactly the same).
The problem is that I can?t find the civil certificate for this marriage in the statutory records. Faughart falls within the Dundalk civil registration area. There was only one Mary Kelly marriage registered in Dundalk in 1874 and she appears to have married either a John Cluskey or a Nicholas Neary. (Dundalk 1874 Volume 7, page 701). Sometimes priests failed to pass the details to the civil authorities (though it was supposed to be mandatory) and perhaps that is what has happened in this case. In which case, sadly, you?ll not be able to locate some fairly essential information. The other possibility is that the marriage has been misfiled in the GRO indexes.
I think what I would do is write to GRO Roscommon (HQ for births, deaths & marriages) and tell them you are looking for a copy of the civil marriage certificate. Tell them that you have located the church record (and give them the details you have) and say you can?t find the civil copy. They will then search the old registers manually to see if it is there (and has been overlooked or the names mis-spelled). If they find it, a photocopy costs ?4.
http://www.welfare.ie/en/Pages/Apply-for-Certificates.aspx
You have to download and print off the form. Then either post or fax it back to them. You can?t e-mail it to them. However if you want them to e-mail the cert to back to you, they will do that, so tick the relevant box.
Just put an accompanying letter in with the application, explaining that you can?t find the marriage in the civil indexes, but that you know it took place because you have the church details.
Elwyn