As a highly educated German immigrant to Brazil, amongst his priestly activities, he authored many books, like:
A evolução e o homem, 1909
As cobras do Rio Grande do Sul, 1913
Fenômenos luminosos no mundo orgânico, 1905
Os Muckers - Episódio Histórico Ocorrido Nas Colônias Alemãs do Rio Grande do Sul, 1912, about the Revolt of the Muckers
His book about the Muckers has proven to be a particularly interesting document not only because it does convey a lot of information about the event and the main characters who played a crucial role in it, but also since it tells, perhaps even more about the pervasive attitude of his time and the local social context towards non-conforming minority religious thinking and practices. Schupp was fluent in many languages: High German, Latin, Spanish, and the Low Franconian German vernaculars most prominently utilized in the German-speaking regions of Southern Brazil. He died in Porto Alegre.