You're playing the wrong game if you are trying to apply any sense of morality, but so far it is very tame, you just make a certain religious girl question sexual views(You convince her that sex is good and feels good) other than that it has a very lovely story behind it, I recommend to play it even if her story so far is short lived
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So basically making her want to have sex because the protagonist wants to have sex with her... And the religion came in between but he had to find a way to get into her pants and that was through changing her mind about religion. It's a classic really and not very insulting as long as it doesn't address the beliefs of certain religion rather it addresses the beliefs of a person.
It's way too common in comics that I have read, that the religious girl gets brainwashed by someone to fulfill that someone's desires and of course the religious girl begins very innocent and ends up showing the "bad girl" inside of her while staying innocent at the same time. The hot thing about this scenario is that the religious girl is too reluctant about taking decisions and takes a lot of time to change her mind unlike other girls in the story.
That's one half of it, but there is also a story half here as well. The religion in this game has a few notable issues, the main one being they are purely responsible for the slavery of elves. Corrupting Autumn religiously also implies changing her mind about elves so that she sees them more like people than animals. (which has never been a huge problem for her)
Religious corruption in this game has nothing to do with God, but religion specifically, and how humans can corrupt it. Humans aren't perfect, so issues can come up.