A second friend, Donald Kern, has just replied to my query on the Helffrich records. "Rev. John Henry Helffrich pastoral records 1790-1810 are in 'Pennsylvania German Marriages' by Donna R. Irish, Genealogical Publishing Co., Baltimore, MD, pp. 509-523.He served in Berks and what is now Lehigh county, PA. This includes John Helffrich records 1816-1862.All the Helffrich ministers were related." The book cited should be available in most genealogical libraries.
Don Kern also added: "Jacob Kerschner (1784-1825), son of Peter Kerschner and Catherine Elisabeth Faust, was buried at Ebenezer Church, New Tripoli, Lynn Twp., Lehigh County, PA on 21 May 1825."By the way, in case you are interested, New Tripoli is pronounced locally as "tri-po'-li" [accent on second syllable like Stromboli.]