Shelagh,
Glad you found the marriage. Scullin, plus variants eg Scullion, is a very common surname in the general area around Toomebridge. You say that the marriage took place at Duneane RC church, Ballymena. Something?s not quite right there. Duneane and Ballymena are different parishes, about 10 miles apart. (Ballymena is in the RC parish of Kirkinriola).
The main RC chapel in Duneane in the 1800s was (and still is) at Moneyglass, near Toome, though there is a second one at Cargin which would also have been in use in the 1830s. Both have graveyards and both are full of Scullins and Scullions. I know from personal experience, as I live locally. However a shoemaker or labourer was unlikely to have had a gravestone.
My hunch would be that your family married in Duneane rather than Ballymena because Scullin etc is so common around the Toome area. (There is even a parish of Ballyscullion nearby).
You can check by looking at the RC parish records for Duneane. There?s a copy in PRONI in Belfast and also in the National Library in Dublin. NLI are going to put their copies on-line free next month, so I suggest you wait till then and search them. That should resolve where the marriage and baptisms took place. Whether or not there will be a townland given is debatable. Marriage records from that era rarely have townlands. Occasionally RC baptism records from the 1840s do but mostly they don?t. Which then makes it extremely difficult to trace the Scullins, especially with such a common name.
A shoemaker or labourer would work from a small cottage and so wouldn?t necessarily be listed in Griffiths. In any event Griffiths for Duneane was compiled in 1862 and it?s not certain Henry was in Ireland at that time, though he might have been.
Having said that Henry might have had other family who are listed in Griffiths. Assuming he too came from Duneane, I notice that the only Hamills listed in that parish in 1862 all lived in Ballydonnelly. John Hamill had a 19 acre farm (plot 26a) and sublet an agricultural labourer?s cottage and garden on it to James Hamill (plot 26b). Nearby William Hamill had an ag labs house (plot 16c) on Robert Chesney?s farm (plot 16a). Those properties today are adjacent to the Ballydonnelly and Ballymatoskerty roads, between Toome and Randalstown.
Curiously there?s a Henry Hamill living there in 1901 but he?s Baptist, single and too young to be the man who married Susan.
http://www.census.nationalarchives.ie/pages/1901/Antrim/Toome_Upper/Ballydonnelly/941939/
Though the 1851 census gives Felix?s place of birth as Ireland, the 1871 says it was Fleetwood, and that is borne out by a birth registered there in Fylde district, in Apr ? Jun 1848 (Vol 21, page 483). So the family must have moved to England between 1846 and 1848. It might be worth getting Felix?s birth certificate to see what Henry?s occupation was then.
If there were no more children after Felix, then perhaps Henry died around that time? There?s a couple of Henry Hamill deaths registered in Liverpool 1851 and 1861. Have you investigated those? (No ages given).
Elwyn