What we mean by faith is well stated in Wikipedia.

Faith is the confident belief or trust in the truth or trustworthiness of a person, idea, or thing. The word "faith" can refer to a religion itself or to religion in general. As with "trust", faith involves a concept of future events or outcomes, and is used conversely for a belief "not resting on logical proof or material evidence." Informal usage of the word "faith" can be quite broad, and may be used in place of "trust" or "belief." For other uses, see Faith (disambiguation).