Tacey became interested in the role of religion and spirituality in secular societies and published several books on this subject, including "Re-Enchantment" and "The Spirituality Revolution". He is often invited to address religious schools and education conferences on the subject of youth spirituality. He is often consulted by church leaders to foster ecclesial and lay understanding of the function of spirituality and mysticism in today's postmodern world. In 2000 he was invited to represent Australia at a congress on religion and world peace at the United Nations, New York. His book "Religion as Metaphor: Beyond Literal Belief" brings together his interests in symbolism, scripture, depth psychology and literature.