The concept of "faith" which, in spite of appearances, I have been holding from the time I left JWs (20 years ago now), implies that I really don't know what I will be able to believe next week, next month or next year.
I don't think you mean to say that they change all that often... but if new facts or ideas come to light, you are completely willing to change your opinions to reflect those facts or ideas?
It is distinct from belief in the sense that it allows me to question (and potentially give up) any particular belief (including "God"). Yet it is not completely something else in the sense that it implies that I act today upon the beliefs I hold today, even if they may change tomorrow.
That is part of the definition of faith I think, that it is sufficient to compel you to action.