You would be having great difficulty looking pre-1850 in Ireland as there is little documental history. There are only 2 Parish with records prior to 1800 and the census substitute
Griffith Valuation wasn't done in Antrim till 1862.
Two sources for parish information in Antrim:www.emeraldancestors.com
free to view but pay for recordswww.rootsireland.ie
not for profit but pay to view and records
You could check for the parents and the youngest child in the hopes that they belong to the one parish. Catholic or
I did check the Griffith Valuation 1862 to find 321 Craigs in Antrim. The names of Robert and Katy's children may give you some leads as to which Craig's might be related. No Dorrance in Antrim in 1862
There are 38 Craig's in the british northern ireland telephone book. 0 Dorrance. If you knew where in Antrim it would help but if not pick a few from the list and try writing some letters. You might find someone who knows their family history or spark and interest or even just some help.