The phrase "have faith" is commonly used to refer to trust or belief in something or someone. There are many synonyms that convey the same meaning, including "trust," "believe," "rely on," "have confidence in," "count on," "depend on," "have trust in," "have belief in," "have faith in," "put one's trust in," and "bank on." Each synonym emphasizes the importance of believing in something despite uncertainty or doubt, whether it be a person, a higher power, or oneself. Overall, having faith is an important aspect of building strong relationships and developing a positive outlook on life.