Kilanerin is a RC parish rather than a civil parish which probably explains why it was not included on the list of Wexford parishes. http://www.ferns.ie/kilanerin/
There are variant spellings for the village--Killinierin is another spellling.
Posting in Inch (Gorey barony) was the correct parish.
By the way, supposedly records for Kilanerin RC parish do not start until 1852 (according to my reference book) so finding records in 1804 and 1807 is a good find.