A faith of any given sort IS a hypothesis, Wolfgang, and it most certainly can be open to refutation. I have had faith in any number of things in my life which was later revised or refuted by EXPERIENCE. I do not agree with your definition of the word "faith". I think you've got it confused with "religious doctrine". Religious doctrine is a specific kind of very narrow faith, and even IT can be refuted or revised in the light of experience....if the person with that faith is moderately flexible in nature.

I am flexible in nature.