If your trust in something falters, the true faith is gone. I have faith in my parents because I believe they are always looking out for my best interests. It may not seem like it to me, but I know what they do is right. It's just a gut feeling you have when you know you're right. I don't know if that's just childish thinking or whatever, but I have always believed that God will take care of everything, if it's not ok, then it's not the end.
Faith is a good and powerful thing.
If you believe in something, you are committed to it. I have faith in God. Seeing isn't always believing. None of us have seen Jesus, but we know he exists because we have faith. I have a lot of faith in people, sometimes too much faith to the point where I feel people are letting others down.