Okay, this one can be a little slippery because 'Divine Romance' is a title that shows up in different places. From my bookshelf-habit perspective, I’d say the first thing to know is whether you mean a devotional/religious work, a fantasy/romance novel, or a self-published contemporary romance — all of those can be titled 'Divine Romance' or something very similar. Without a cover image, publisher name, or ISBN, it’s tough to pin a single author to the phrase, because independent authors often reuse evocative titles and small presses sometimes retitle things for new markets.
If I were tracking it down for real, I’d start with quick checks: type "'Divine Romance' book" into Goodreads and sort by relevance, do an ISBN search on WorldCat, and peek at Amazon listings (publisher and publication date help a lot). If it’s religious, the subtitle usually gives the author away — detach the subtitle and search that. Once I found a likely match I’d verify by checking the publisher page or the Library of Congress entry. I once misattributed a novella because two indie novels shared a title; the ISBN cleared it up instantly. If you can share a snippet of the blurb, the year, or a line from the book, I’ll dig further for the exact name.