The Charleville RC parish baptismal records start in 1827 so it is unlikely that baptismal records exist for James and Johanna. Marriage records are available for late 1794 to mid-1822. On July 8th the National Library of ireland plans to place all RC parish registers online for free searching. Charlesville is in the Diocese of Cloyne.
I looked at the 1852 Griffiths Valuation Head of household listing for Ratgoggan civil parish. Although there were Gormans and O'Gormans , there were no James records. Possibly they had left by then. http://www.failteromhat.com/griffiths/cork/rathgoggan.htm
No way of knowing if their are relatives in the area now. There was only one O'Gorman family in the 1911 census for Charleville. http://www.census.nationalarchives.ie/pages/1911/Cork/Charleville/Broad_...
Charleville Marriages Aug. 10, 1774 - Nov. 15, 1792 P.5001 Dispensations Sept. 1, 1774 - Jan. 9, 1793 Marriages Nov. 23, 1794 - July 3, 1822 __________________________________________________________________ Baptisms May 2, 1827 - Dec. 31, 1880 P.5002 Marriages June 3, 1827 - Dec. 9, 1880 _____________________________________________________________________