Brothel slaves were often of Gallic origin -- that would be modern Spain (Celtiberians), France, Switzerland, and northern Italy (Cisalpine Gaul).
The only sign of Christianity from that time and place I've seen is a pic of a small, apparently concealed room, I think it was in Herculaeneum and on an upper floor; the pattern of holes in the wall suggests a cross had been attached, and it may have been removed well before the eruption (owner sold the home and took the cross, or moved it to a different location, or abandoned Christianity).
Among Roman Jews, the destruction of the cities was seen as retribution for the Flavian destruction of Jerusalem.
A mirror from India with an ivory handle carved in the shape of a female fertility deity was buried under volcanic ash at Pompeii in 79 CE. Among the first images of Buddhist deities in human form were those carved in the province of Gandhara (present-day Pakistan) in the 2nd century CE. Unlike anthropomorphic Buddhist images carved farther south in India, these Gandharan figures, which were based on provincial Roman models, wear heavy, toga-like robes and have wavy hair. The figural tradition of Buddhist art spread through Central and East Asia and also to Southeast Asia, taking on local and regional characteristics. [Arts of the Silk Roads | by John Major | Asia Society]
Thanks for that. After thinking about it further, I'm realizing that the pictured couples could be expected as appearing outdoors-tanned or indoors-not-tanned. :-P
Alternatively, the cross could have been moved to a museum.