For what it's worth, I would have trouble with that scenario, too. (Trouble? You ain't seen trouble! "Under a spell?" I'd put him under something else!)
Quite frankly, what your mother does is her business. It would make me distance myself, too; but she really doesn't have to answer to you. Maybe one day she will be able to share what's been going on inside her and influencing her decisions.
But, of course, when your father took his original action, it affected so many more people than his wife. It's very common to think, "I'm an adult, and I can do what seems right to me, and anybody else can just deal with it; my life is my own business." Not so. Just look at what you've written - the effect was like ripples in a pond. Many, many people were hurt - probably more than you'll ever know. That's what happens. He hurt his whole congregation and they, being at a loss, hurt you.
I can't tell you how angry thinking about this whole thing makes me!
And you are STILL hurt. You are probably not the only one still hurt.
I wouldn't say you're being childish now, but you're probably re-living the feelings you had ten years ago (even though you were not a child then). It would be like a nightmare returning to haunt you - something out of a movie.
You do realize, I hope, that you are not to blame for any of your father's actions, no matter what he has said at *any* time.
If it were me, I would look for a counselor who could help me sort out my feelings. The last thing you want is for all this to have an effect on your own marriage and family.
If you haven't turned your back on church altogether, it might interest you to know that there are counselors in some church denominations who specialize, so to speak, in circumstances like yours. Or so I have been told. They are around because those few bad apples in the barrel do SO much damage.