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Romanism (n.)

"Roman Catholicism" (usually, if not always, with a disparaging savor; in some contexts suggesting political allegiance to the Vatican), 1670s, from Roman + -ism. Other words in the same sense from about the same time were Romanish (Old English, but 1590s specifically of Catholics); Romanist (1520s); Romanistic.

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Definitions of Romanism from WordNet

Romanism (n.)
the beliefs and practices of the Catholic Church based in Rome;
Synonyms: Roman Catholicism / papism
From wordnet.princeton.edu