faith
noun
1 he completely justified his boss's faith in him:
trust, belief, confidence, conviction, credence, reliance, dependence;
optimism, hopefulness, hope, expectation.
▷antonyms mistrust.
2 she gave her life for her faith:
religion, church, sect, denomination, persuasion, religious persuasion, religious belief, belief, code of belief, ideology, creed, teaching, dogma, doctrine.