sectary
A member of a particular sect, school of thought or practice, party, or profession; a sectarian.
Be it as it may: within the Land of Penn / The sectary yielded to the citizen, / And peaceful dwelt the many-creeded men.
A Protestant dissenter or nonconformist.
Where it comes from
Either from the French sectaire or directly from its etymon, the Medieval Latin sectārius, from secta (“sect”). Cognates include the Italian settario and the Portuguese and Spanish sectario.
Adapted from the Wiktionary entry sectary (CC BY-SA 4.0).