I'd be surprised if they're all Catholic, not because Catholics aren't as capable of grift as anyone else, but in NI that attitude of 'I didn't need an education, I could get any job I wanted' was a very old-time protestant thing when the community was extremely well networked and protectionist. The Catholic schools, and the community they served, always knew the only way out of poverty for them was education. It's why there was a tendency in recent years among NI prods to regard all those Catholics with academic and professional posts as evidence of some kind of conspiracy involving sneaky Papist ways.
I dithered a bit about the name Murphy, but my old pal the 1911 census lists hundreds of Presbyterian Murphys and even more Presbyterian Boyds.
Arlene Foster was up to her neck in RHI.