Sherlock Holmes is Jewish
You will take this over my cold dead body, if you can pry my battered and much-loved New Annotated Editions from my rigor-mortised fingers.
Holmes is described as dark-haired and pale, with a large nose and deep-set eyes–all characteristics of the “typical” description of a Jewish person (and the kind we might expect out of a series from the 1880s). He’s a violin virtuoso and makes his money in nontraditional ways (prizefighting, being a consulting detective), much like Jewish folks in England once p much had the option of being peddlers or tax-collectors but most of their means would have had to be earned “off the books.” His close family is never mentioned except his brother Mycroft, who’s basically kept his job only by making himself truly irreplaceable.
Holmes has academic knowledge of some religious subjects, but scoffs at the idea he’d have a bible in his house even though he keeps a wide variety of reference-books. He’s also well-educated, and although he takes fees for his consulting work, he states multiple times that if a client is poor and the case is of sufficient interest, he’ll waive his fee altogether–an act of tzedekah, perhaps?