Game concept
Refuse Conversion
The game also links it as Refusing Conversion, Refused Conversion.
From the game's encyclopedia
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Refuse Conversion is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "Refusing to convert will be considered a Crime if:" It is part of Demand Conversion. The game also links it as Refusing Conversion and Refused Conversion. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.