There are actually two dynamic forces here.
One of them is the possible chance for abuse of power, but an equal force is your reaction and the way it makes you feel.
As for abuses, you know the old saying, "Power corrupts and absolute power corrupts absolutely." However, this dynamic is his problem. You're not his wife, his mother or his shrink. There are plenty of people I don't like. I simply tell them so in plain language and request they give me a wide berth.
The one issue you can address is what this issue does to you and your psyche' when you act this out.
Can you be logical about an issue that sends adrenaline raging through your system? Probably not. I suffer with those same demons myself--daily, and most times I lose.
I'm not a big fan of "professional religionists" who bilk people with fables of damnation unless "indulgences" are generated. I think my Mom was led around by the nose on this issue, and I know one of cousins believes in this nonsense.
Upon my Mother's death, I received an incredibly expensive leather and silk bound tryptic, which my cousin undoubtedly paid thousands of dollars to purchase. It announced that eleven masses would be said in order to get my Mom out of Purgatory.
You do not want to know my thoughts.
But, I figure this way, as angry and betrayed as I was, that money grubbing, boy loving, false prophet will one day meet a Guy a lot more angry than I'll ever get.
You cannot control the hearts of others. But you can control yourself.