Looking for the Lynch's, Seefin Townland

Good day all!

Our ancestor, Peter John Joseph Lynch (b. 1835) to Edward Lynch and Mary Cusack immigrated to Cincinnati, Ohio via Canada after leaving his little townland of Seefin, Knockbride parish.  James may have come to Cincinnati before Peter, but Katherine followed later.  Another sibling, Patrick married and left for Austrailia, all during the beginning of the famine.  Edward is listed on the Griffiths Evaluation living next to his mother Anne, and renting acreage and lodgings from a Josph Dixon.

The only relation to ever go back or to keep in contact with family members was Fr. Kenneth Lynch, a Passionist priest.  He visited many times, and stayed, collecting bits of information, but none that really "fit" together that I can tell!

In some of his letters, he references a St. Brigid's Church in Tunnyduff, and I'm wondering if that's where our people's records may be, such as christening, marriage, etc.  Living in Kentucky and not being able to "see" where all these areas are geographically associated, I have difficulty grasping it. 

Does anyone have any lines that cross the Lynch, Cusack line? 

Does anyone know the best way to inquire about church records?  Since I'm in the US, I'd like to do it efficiently :)

Thanks and good luck to all!