Hello Debbie
not sure there is a volunteer in that part of Cavan, I have looked around at some sites and the Devan name turns up there in Griffiths on Ask About Ireland as you say in Derrymony, RC Church records only appear to commence for Templeport in 1836, and the name from the Templeport history site which I will attach has the name Devine and Divine, I am assuming there is a transcription or spelling error or some such at some stage. In the townland of Derrymony in the Tithe Applottments there are 2 entries in 1826 for Richard Devine, unless we turn up some land records or a will both probably unlikely as they appear to be tenants of a Rochefort gent. See http://titheapplotmentbooks.nationalarchives.ie/pagestab/Cavan/Templepo…;
The Templeport site includes mainly Bawnboy but has burial and baptismal records but is not the easiest to navigate, I emailed them myself in a general way previously but got no reply.
http://www.bawnboy.com/local-genealogy/templeport-burials.html I am assuming RC but other religons are included on the site.
DNA matching is most likely way to get results prior to 1836 if that is when the RC records commenced, other religions may have earlier records but they did not turn up when I looked at Roots Ireland, a subscription site.
On the plus side there are two fairly active Facebook pages for Cavan genealogy, IGPS Cavan and Cavan Genealogy, apply to join and leave a message, use both forms of the name though, I searched both pages and the IGPS Cavan has some Devine hits including one from PA. The other spelling on the Templeport site turns up Divine. I have a Cavan ancestor myself hence I can check the FB pages readily as a member.
I also looked in McLysaghts Surnames of Ireland and Devine is sometimes confused with Davin but that is in Tipperary not Cavan so I think somewhere the name changed, oddly I see two Davan births in Cavan in 1840 and 1842 in Kingscourt, this is a long way from Templeport in Cavan, for the time rather than now, maybe 40 miles or so.
Have an enjoyable trip it is a pretty spot if a little remote.
Please revert if you have any further queries and consider leaving your information on the Templeport parish Chronicles.
Good Luck
Pat