The PSP game actually gives us a little bit of this! He preaches about how Despair is the root of all evil, and Hope is the ultimate virtue that will save the world. Basically he's a Madokamist. However, he literally says "The scripture cannot save anyone, we need a new faith, I'll speak in my own words", and the congregation was just.... not fucking having that at all. Admittedly it was also implied he was preaching that there are no actual sins except for malice (theft, murder) and that stuff like homosexuality was all gucci. So, y'know.
Also, while researching this I have to amend my earlier post. Apples... are Momo's favorite food. Kyouko eats them because they remind her of the last thing she wasn't able to indulge her sister in.
God fucking dammit, Urobuchi.
That whole "The books' words cannot help us, my words will" doesn't sound much like a preacher who cares about god. Not one bit. This actually feeds into my theory that Kyouko's father cared more about power than anything else.
There is a reason why sects of Christianity like Mormanism are despised by those other sects. It's because they looked at the holy book, the written word of god in their eyes, and said "that's not how god works,
this is, and we'll write our own book for proof!". It's basically saying that you know more about god than those who wrote the bible, and, depending on your view of the bible,
god himself.
Kyouko's father has done the same thing, even if his version of Christianity is a lot less 'hateful' than the teachings of other sects. It essentially stated to his congregation that his word is above the word of scripture, of
God. That's why they left when he did this, they saw him either as a blasphemer or a megalomaniac
And, given the multiple acts of malice that have been mentioned that he has done, he may not even believe in his own teachings. Granted, a good portion of it was done after Kyouko revealed her wish, but still.
Perhaps that's why he went insane after the wish was revealed?? Because his congregation, his
power, wasn't something he gained himself, but something that was gifted to him by some higher power. A power that could take it all away at will. And to a megalomaniac, there's nothing scarier.
(Obligatory 'could be completely wrong')