It actually does. If you don't know what it is you have faith in, then what exactly is it you have faith in/believe? You can't have faith in an abstract concept. If you do, then "faith" is the wrong word for it. You might have faith in that there is something more than what science can prove. A widely abused platitude, but is none the less correct usage.
Christian mysticism and any mysticism cult, were political compromises. They never did make any sense. Nobody educated has ever claimed that. And all these usages of "faith" hail from there. If Spock was here, he'd call it illogical.