From The Art and Popular Culture Encyclopedia
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."
Faith is often used in a religious context, as in theology, where it almost universally refers to a trusting belief in a transcendent reality, or else in a Supreme Being and/or this being's role in the order of transcendent, spiritual things.
Faith is in general the persuasion of the mind that a certain statement is true. It is the belief and the assent of the mind to the truth of what is declared by another, based on his or her authority and truthfulness. The English word faith is dated from 1200–50, from the Latin fidem, or fidēs, meaning trust, akin to fīdere, which means to trust.