Here's an idea you can run with. You can become very famous writing this book that I myself don't have time to write. All I ask is that you cite me. If this book already exists, and I don't know about it, and you do, let me know. But please don't tell me about a book that kinda sorta does this, but really doesn't.
Basically, it would be called "aesthetic rationales for the sacred." It would study the way in which aesthetic arguments supplant religious ones, or religious arguments take refuge in aesthetics. This is a familiar idea, one that is all around us, but it needs a full-length book treatment.