TLDR: my personal view is one needs to change certain aspects of the game or history when it comes to Divine, Infernal, and the Church. Which is why I usually ignore it or make characters completely ignorant of the topic.
Faeries are fake, but may mislead ignorant folk. Daimons just want Vis and use ritual sacrifice for magic efficiency.
Pretty much everything that wants to be worshipped is evil. Don't get me wrong, I'm pretty sure 'Magic Gods' want followers, observation of special days, special animals, and all around veneration. Really Faeries just want attention.
Which leaves the other "two" realms. The Divine assuredly exists. However a commitment to Any religion is insane. Especially the Divine ones.
Heresy is worse than Paganism, though both can get a public outspoken figure killed. The latter gets ignored in the country and fringes. Heresy calls for sending out someone to kill the heretics. Pelagius in Ireland, which is debatable if Patrick's snakes were heretics, I actually doubt it. In game though the New Aristotle at the college of Paris, also a historical event, is mentioned in A&A.
So making a commitment to absolutely anything that can be misconstrued as heresy is insane. Religion persecutes the similar much harder than the alien. (Japanese persecution of Christians for considering Christ their lord and not the Emperor after previously accepting them as a Buddhist variant happens to come to mind.)
Hermetic magic can't tell the difference between god and a powerful demon.
Since Divine Grace is irresistible and a thing one can experience, how does one know if a friend was touched by god or a demon? You don't. The only people that do seem to be able to detect demons... happen to be the same political entity that says not to dance, have music, or venerate daimon protectors etc. want money and influence over kings. Convenient, isn't it?
Once you get into the Jewish concept that Demons do God's will as punishment for disobedience... Disobedience of a magical protector of a political entity. Now one asks if there isn't just one Realm and not two.
Most of the people being misled by Faeries and Demons are the desperate poor. Which then one needs to ask if the socioeconomic oppression and torture of the poor is really worth something so petty. I don't see how an educated character can worship, nevertheless respect, such a monster and earnestly think they're good for doing so. If anything it's deciding to join those in power for power. Now the Church starts to look more insidious than the historical Church.
How can two different faiths have True Faith? The moment the two characters meet their faith will be called into question. The Church if Divine knows the other religions it condemns are Divine. So then, how can the Church be good? It has to be depraved, it's the only way to make sense of history and keep Divine good.
Even if we ignore that, the monsters of the world are real and very much exist. They aren't just Faeries feeding off fear. Or giants wanting your bones for bread. They want very bad things to happen to you and threaten you everyday by calling what you do a sin.
No one knows though which one's are the real one's. So it's really just better to not commit to any and keep your head down from my perspective, lol.
Which is really why I ignore the RAW and run Divine as humanism and Infernal as depravity regardless of religion. The latter I do Lovecraftian horrors and what not. However you guys would like to run it, I'm easy
I usually make characters completely ignorant of the topics and neither Christian or Pagan and just go with the flow.