My Mathers line was from that area of No Ireland. My Grandfather Mathers had a sister, Mary (Minnie) Mathers that married a Joseph Graham about 1889 and I believe they moved to Australia or NZ. The Mathers family migrated from the Lurgan area to Ballymacmain in Co Down. Maybe there is a connection. I was at Public Records Office of No Ire. (PRONI) a year ago and they have a lot of Presbyterian records on microfilm.

I have some Presbyterian records and have been looking at Grahams, but also Bairds. Who are you looking for?
conard_kc at hotmail.com