Before this gets ugly, I will say my two cents worth and then run for cover.

Much of it is point of view. Faith is if you are the believer, superstition is if you are not.

I would add that there seem to be connotations that faith is usually thought of as a more positive, complex / interrelated / singular system of beliefs, while superstition has more negative connotations, being more associated with individual events / actions / rituals that do not appear to be interrelated to each other.

Again, this is all perspective and point of view. You may not personally have faith, but still recognize something as faith if you share a common context. If you do not share a common understanding, any singular event seems a random instance, perhaps nonsensical out of context, and is often perceived as a superstition.