At least as to the words, “Image of the Invisible” agrees exactly with a phrase from the Letter to the Hebrews in the New Testament: ‘He [Jesus Christ] is the image of the invisible God...”.The fanfic I'm speaking of, incidentally, is "Image of The Invisible" so good on multiple levels (my "interview" section at the end of the fic explains in detail)
Whether a quotation was intended, is another question. It is the kind of phrase that people can pick up, regardless of their own POV, and put to use in a context unrelated to its original use.