Going through old posts and found this one - have you already found the information on this family that you were looking for earlier? Since then lots of Irish resources have come online.
Suspect that no one was able to help you is that it isn't really clear exactly what sort of information you were looking for.
There's a new website for Maghera district which has some records for Saltersland Presbyterian Church:
www.magheragenealogy.com/presbyterian_church_recordsOther resources are listed at the top of the Derry/Londonderry board and IRELAND RESOURCES board.
If you don't need help with this topic anymore just add the word 'completed' to the first post on the thread and if you do need help or have any questions just let us know.