"Keys to the Kingdom: Jesus & The Mystic Kabbalah," by Migene Gonzalez-Wippler is one of the books I was thinking of.
There are actually a number of books that discuss Jesus, or Christianity, from a mystical / occult perspective. But this is the one that pops most readily to mind, because I've read it a couple times, and I actually own a hard copy. There's also some info on this topic to be found online, if it's something that interests you.
Oh, and FWIW, the author of the aforementioned books also wrote one of the most comprehensive books on amulets and talismans I've ever seen. Definitely would recommend it to anyone with an interest in those topics.