A person who believes in exclusivism; or relating to the belief that something should be practiced or followed to the exclusion of alternatives.
From 'exclusivism' + '-ist.' The '-ist' suffix identifies someone who practices or advocates for a particular ideology.
Some philosophers argue that exclusivism is logically inconsistent—if you think only your beliefs are true, you can't rationally respect others' right to believe differently—making this a word that captures a genuine philosophical puzzle.
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