Seriously though, I think the "blind faith" usage of the term faith is its weakest form. "Trust" and "confidence" are good synonyms. Because as a rule, humans have faith in a great many things, and the vast majority of those faiths are not characterized by a lack of knowledge or evidence. Consider the following statements:
- The astronauts had faith in the laws of physics.
- My husband was unfaithful to me.
- I've lost my faith in humanity because FooBar was elected.
- Have you no faith in me?
- The war started when our allies broke faith with us.
- You should always negotiate in good faith.
- My dog has been my faithful companion for a great many years.
Think about the faith being represented by those phrases. Does the person who had the faith have it without intimate knowledge of the object of the faith? No! The faith existed because of what they knew about the object, not in spite of it.