religious has 1 distinct synonym spread across 1 of its 5 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are irreligious, secular.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
having or showing belief in and reverence for a deity
“a religious man”
of or relating to clergy bound by monastic vows
“the religious or regular clergy conducts the service”
1 of the 5 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for religious.
Synonyms, antonyms and the broader and narrower relations for religious come from Princeton University’s WordNet. Full sources and licences.