This site has church records for Bann Valley as well as other helpful genealogical records. From the website covering Bann Valley genealogy:

“The River Bann flows through Ulster (in northern Ireland), separating Londonderry from Antrim. It drains Lough Neagh (which you can hardly miss on any map!) to the north, meeting the sea at Coleraine near the Giant’s causeway. …There are two a mailing lists associated with this site, One is for discussing matters related to Torrens families genealogy and the second for anyone descending from the Bann Valley families. Since many of the Torrens families originated in the Bann Valley area, the two lists are closely related! …Bann Valley Church Records Most of the original records in this section were collected in person by Lavonne during visits to the area. They are now being added to by others. They have their own index page:http://www.torrens.org.uk/Genealogy/church/”