When we talk about having confidence in something, it means that we trust it, believe in it, and have faith in it. There are various synonyms for the phrase "have confidence in," including "rely on," "count on," and "bank on." Other options include "have faith in," "believe in," "trust in," "have trust in," and "have faith in." All these synonyms share the same underlying meaning of having a level of assurance and trust that something or someone will do what they are supposed to do. These synonyms can be used interchangeably depending on the context and personal preference, but they all convey a sense of reassurance and trust.