Since the Minister is an authority figure all he really has to is predict the success or failure of an enterprise and sleeper belief will cause it to come to pass. This biochemical emotional response can be caught and distilled into pure tass. Spirits can be used to spy,to influence sleepers when they are not under our direct supervision and they can be usefull policemen and bodyguards in the Ascencion war. Faith Healing is definitely frowned upon by our study group. It is a little easier to laugh at the trials of an enemy who has constant problems with injuries and illness.
Miracles involving forces are nearly impossible to deny.
Again, as above.