I like that they used the Blair Witch style, but I thought it was better than Blair Witch. It was so normal in the beginning. it could be any couple. And there was nothing terribly special about either of the main characters. The fact that it's entirely possible that it could happen to literally anyone, is what makes it scary. Not the little moments that sneak up on you, and make you jump a bit, but the fact that it could happen to you. And it's applicable to believers of different religions. There's nothing saying it wasn't a fabrication of her own untapped mental psyche, and there's nothing saying she wasn't a reincarnation of a previous owner of the issue. I'm still wondering how close to the truth they kept it.