I read a novel in the late 70s/early 80s (may have been written earlier, but it seemed contemporary) with the conceit that magic was an ordinary part of everyday modern life. I don’t recall the details of how this was worked out, but my memory is that it was suburbs, cars, contemporary America, plus magic. The main character was a werewolf, and the one detail I remember well is that he had an invisibility cloak called a Tarnkappe.
The plot revolved around some kind of secret war in the Catholic Church, which was a dominant institution and pro-magic. I don’t remember the theology of it, but in this world the church had been shaped mostly by the teachings of John (which John? I dunno) and not Peter. The “Petrine” faction, which was also against magic, was trying to take over.