According to the PRONI website, there are 4 churches in the Church of Ireland parish of Termonmaguirk. The one at Cooley or Sixmilecross, which may be the one referred to above, has baptisms from 1836 onwards. Those for 1836 to 1871 have been copied and are held in PRONI on microfilm MIC583/7. Later records are still held by the church.
The local Presbyterian church in Sixmilecross has no records prior to 1900 (earlier records were destroyed in a fire).