He was supposed to be religious.
I have no doubt he was, although I can't remember if he was Slovien or Slovak, just a story from my mother's neighborhood.
My mother also said she would get a dime for starting up a stove from an Orthodox Jewish neighbor family on Friday night.
Andy Warhol was Catholic, gay, and attempted to be (with varying reports of his success) celibate. He was incredibly talented, able to free-hand draw a circle with unrivaled perfection. And he was hugely conservative. His obsession with Campbell’s soup was based on the fact that as a child, he was very sickly and his mom was a single, working mom; she could often feed him nothing but soup, but he thought that the fact that there were so many dozens of kinds of Campbell’s soup was a miracle of American industriousness. He tried to praise God in such ordinary miracles; turning common pop culture into religion-inspired icons.
The tension between his deep faith and his sexuality was an artistic focus of his; he struggled with why God had allowed him to be incapable of having a family or joining the priesthood (unlike so many corrupt bishops, he believed his homosexuality rendered him incapable of the priesthood), so he was in turns angry at God and deeply worshipful.
Ruthenian Catholic, which I think is a subset of Eastern Orthodox.