Idea for you to make a bible game about Jesus.Forty days about Jesus time in the wilderness.
How about one about spirituality in general? I wouldn't mind letting some of that into my games in time.
I liked that in harrow 2 you can pick up and read the books while turning pages.Thought of a full chapter or book of the bible.The horror stories like those classics about the wolfman and dracula could be done I think open source stories.Having the detective on assignment trying to unfold the mystery aboard on some foreign assignment.Realizing the bible is true and only way to fight and defeat thermometers aren't physical weapons but spiritual ones.Starts as a cynic and ends as a believer.
It took me a second to realize what you meant by thermometers, heh. It kind of sounds like you should make a Quest game, no? You've got quite a few good ideas.