There is quite a good literature on aesthetics that gets at spirituality. I co-authored a recent book (out last year) with the American artist Jil Evans: The image in mind (Continuum) that gets at the aesthetic dimension of different ways of viewing the world (principally theism and naturalism) and we have a co-edited book Turning Images with Oxford that deals with aesthetics and religion / spirituality. An older book which has an excellent collection of different thinkers is: Art, Creativity, and the Sacred edited by Diane Apostolos-Cappadona. Gordon Graham has a good book: The Re-enchantment of the Word (OUP 2007), and Oxford has published an amazing series of five books on aesthetics and theology or the sacred by David Brown. It is disappointing that the Routledge volume did not include more on spirituality, as many of those who contributed to aesthetics historically and quite recently have had spiritual concerns. Plato's dialogue on beauty, the Symposium, is partly about the ascent of the soul to the higher beauties, and it deeply impacted subsequent religious thinkers and artists. Three quite diverse thinkers from the 20th century who thought of aesthetics in spiritual terms include Kandinsky, Dewey, and Tolstoy. Good wishes!
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I am very interested in the idea of aesthetics as a spiritual phenomenom. Spirituality for me is not something limited to one religion. I recently bought the Routledge companion to Aesthetics and I also have a collection of academic essays in aesthetics that is supposed to be comprehensive. But I am very disappointed, the only essays or chapters that relate aesthetics with spirituality are those of 19th century German thinkers but no thinkers that are modern. I would really like to study this subject (probably entirely outside the university) and contribute an article in a journal but I don't know the names of those journals or if any exist. So what journals are there on that subject? (the intersection of spirituality and aesthetics)