I might add that by my definition, you cannot have "faith in" something. That is an oxymoron. Faith is unknowing, openness, willingness to expand. Children are full of faith. As people collect beliefs, they tend to close down.

When someone says have "faith in" this or that, they are using the word as belief.

EDIT: Well, I suppose you might be able to say 'have faith in something', if you mean being open to experiencing that something without prejudice or preconception, simply opening to the truth of it, without knowing what you will find. But that is not how most people use the phrase "faith in".