From June 22 to 25, 2026, the Association of United States Catholic Priests (AUSCP) is gathering for its 15th Annual Assembly at the Renaissance St. Louis Airport Hotel in St. Louis, Missouri. The assembly’s theme is “Building the Future: Church, Priesthood, and Global Engagement.” Among the featured keynote speakers is Sr. Kathleen Duffy, SSJ, PhD, Professor Emerita of Physics and Director of the Institute for Religion and Science at Chestnut Hill College and President of the American Teilhard Association. Her talk is titled “Building the Church of the Future with Teilhard de Chardin.”
The speaker has been selected. The title has been announced. What remains is to ask what, precisely, is being built, and on whose authority.
A Meeting of Like Minds
To understand why the AUSCP selected Sr. Duffy, it helps to understand what the AUSCP is. Founded in 2011, the Association of United States Catholic Priests presents itself as a fraternal organization for ordained men, but its action pages reveal its actual agenda: advocacy for women’s ordination, dissent from defined Church teaching on a range of moral and disciplinary questions, and a consistent posture of pressure against the hierarchical Church in the name of “the People of God.” It is, in short, a dissenting priests’ organization, one that uses the language of Vatican II to advance positions the Council itself did not authorize.
Sr. Duffy is a dissenting nun. A member of the Sisters of St. Joseph of Philadelphia, she has spent her professional life promoting the thought of Pierre Teilhard de Chardin, SJ, the French Jesuit paleontologist whose writings were subjected to a formal Vatican warning in 1962, a Monitum from the Holy Office cautioning that his works “abound in such ambiguities and indeed even serious errors, as to offend Catholic doctrine.”
An organization marked by dissent has chosen a dissenting religious sister to keynote an assembly devoted to building a Church of the future, one that looks considerably different from the Church’s past. The vehicle for that future is a thinker the Church has formally warned against.
Who Is Sr. Kathleen Duffy?
Sr. Duffy holds a PhD in Physics from Drexel University (1979) and has spent her academic career at Chestnut Hill College in Philadelphia, where she is Professor Emerita of Physics and directs the Institute for Religion and Science. She is also President of the American Teilhard Association, which is headquartered at Chestnut Hill College.
Her bibliography is devoted almost entirely to Teilhard. Among her publications are Teilhard’s Mysticism: Seeing the Inner Face of Evolution (Orbis, 2014); Teilhard’s Struggle: Embracing the Work of Evolution (Orbis, 2019); Rediscovering Teilhard’s Fire (St. Joseph’s University Press, 2010); and, most recently, Pierre Teilhard de Chardin: The Mass on the World: An International Celebration (2025). She serves as editor of Teilhard Studies, the biannual publication of the American Teilhard Association, and sits on the advisory board of Cosmos and Creation at Loyola University of Maryland.
She is one of the leading institutional promoters of Teilhard’s thought in the United States. She does not merely study him. She runs the organization dedicated to his rehabilitation, edits its journal, and guides retreats for priests and religious in his ideas.
What She Actually Teaches
Sr. Duffy’s theological project is not a neutral academic exercise. It is a constructive program.
At the center of her work is what she calls “Sophia” — a figure drawn from Teilhard’s mystical essays and the wisdom literature of Scripture, but developed into something considerably more ambitious. In her chapter “Sophia: Catalyst for Creative Union and Divine Love,” published in From Teilhard to Omega, she describes Sophia as “the dynamic wisdom and life force that has been infused into every elementary particle from the beginning, the presence of God poured out in self-giving love.” This Sophia figure is not a scriptural literary device or a divine attribute. She is a personified cosmic agent who has been guiding protons to fuse, galaxies to form, and species to evolve since the Big Bang. This is not Catholic theology. It is panentheism dressed in scriptural language — and it is precisely the kind of synthesis the 1962 Monitum was designed to flag.
Equally telling is her framing of those who might object. In her own published writing, Duffy places “Christian traditionalism” and “current scientific naturalism” in the same sentence as twin forces that “have the effect of ‘clipping the wings of hope.'” Doctrinal fidelity, on this reading, is not the corrective to scientific materialism. It is the other jaw of the same trap. For an audience already disposed against the Church’s magisterial tradition, this framing functions as theological permission.
Her presentations frame the relationship between faith and the cosmos in evolutionary terms. In her lecture “Emerging Spirituality in a Chaotic World,” she describes the task as “steeping ourselves in its dynamism, sensing its evolutionary direction, and sinking into its beauty” so as to “become continually more conscious of our part in its ongoing evolution.” The governing framework is not the revealed deposit of faith. It is the New Cosmology of Thomas Berry and Brian Swimme. Both are represented on the American Teilhard Association’s advisory board. In this framework, revealed religion is subordinated to cosmological process.
Formation as Resistance
Sr. Duffy’s retreat ministry is where her ideas move from the page into the formation of living priests and religious, and it is here that her agenda becomes most explicit.
She guides retreats at venues including Bon Secours Retreat Center, Villa Maria Education and Retreat Center, the IHM Motherhouse, the Weber Center, the Sisters of St. Joseph Center for Spirituality, Maryknoll Mission Institute, and international organizations in Australia and Canada. The pattern is consistent: the audience is women religious and, increasingly, clergy. The message is Teilhard.
A retreat description from the Weber Center in September 2023 contains Sr. Duffy’s own framing in unambiguous terms. Noting that Teilhard “was forbidden by his Jesuit Order to speak and publish” on the relationship between evolution and Church dogma, she invites participants to “reflect on how Teilhard’s approach to struggle might not only give us hope for the future but also encourage us to continue to struggle for the kind of change needed in our Church and in our World.”
The retreat titled “Drawn to the Road of Fire: Teilhard and Struggle” at Bon Secours reinforces the same logic: participants are invited to explore how Teilhard dealt with struggle “as a Jesuit, as a faithful member of the Church,” and to apply those lessons to “the struggles that we face in our lives and in our world today.”
The audience at the AUSCP assembly will include priests. The same formation offered to women religious will be offered to priests. The downstream consequences reach the parishes that those priests serve.
The Man She Is Promoting
Sr. Duffy’s AUSCP keynote presents Pierre Teilhard de Chardin as a guide for building the Church’s future. Before accepting that premise, it is worth recalling that Teilhard remains one of the most controversial figures of the twentieth century.
In 1962, the Holy Office issued a formal Monitum warning that Teilhard’s published works “abound in such ambiguities and indeed even serious errors, as to offend Catholic doctrine.” That warning has never been rescinded.
The concerns were not minor. Teilhard rejected the traditional understanding of original sin, viewed Adam and Eve as symbolic rather than historical figures, and described his life’s work as the construction of “a new religion” in which God becomes “the soul of the world.”
Critics have challenged Teilhard’s system from theological, philosophical, scientific, and historical perspectives. Dietrich von Hildebrand argued that his thought was fundamentally incompatible with essential Christian doctrines. Wolfgang Smith likewise argued that Teilhard’s evolutionary framework functioned less as science than as a comprehensive metaphysical system.
Questions have also persisted regarding Teilhard’s connection to the Piltdown Man affair, one of the most notorious scientific frauds of the twentieth century. Harvard historian Stephen Jay Gould argued that Teilhard may have been more deeply involved than is commonly acknowledged, though the matter remains disputed.
Lepanto Institute has examined these issues in detail elsewhere, including Teilhard’s theological errors, the campaign to have him declared a Doctor of the Church, his scientific claims, and the Piltdown controversy. Readers seeking a fuller treatment may consult:
- Fr. Teilhard de Chardin: Dissenter Condemned by the Holy See to Become a Doctor of the Church?
- The Move to Make the Dissenter a Doctor of the Church
- More Scientific Contradiction of Fr. Teilhard de Chardin
- Teilhard de Chardin and the Fraud of the Piltdown Man Was Followed by the Bluff of the Peking Man
Sr. Duffy presents Teilhard as a visionary for reinventing the Church. The Church herself has never agreed. His works were formally condemned as ambiguous and erroneous in 1962, and that condemnation stands unrepealed; his theology and scientific legacy have been disputed by serious critics ever since.
The Central Contradiction
Sr. Duffy and her colleagues at the American Teilhard Association have done something remarkable: they have petitioned the Vatican to declare Teilhard a Doctor of the Church, the highest teaching honor the Church can bestow, reserved for those whose sanctity and doctrinal contributions are beyond question.
A man under a formal Vatican warning is the man Sr. Duffy’s organization wants declared a pre-eminent teacher of the faith.
And simultaneously, Sr. Duffy presents his censure by Church authority to her retreat audiences as a heroic model for resistance — as proof that the Church was wrong, that Teilhard was right, and that faithful Catholics should follow his example in struggling for “the kind of change needed in our Church.”
The Magisterium is not, for Sr. Duffy, a living authority whose judgments bind the faithful. It is an apparatus to be resisted when it produces unwanted judgments and commandeered when it might be made to produce useful ones. She wants the Church’s megaphone. The petition for a Doctorate is not an act of submission to ecclesiastical authority. It is an attempt to use that authority as a tool, having the institution ratify, under its highest imprimatur, the very synthesis it has warned against.
The Stakes
The AUSCP assembly is not a fringe event. It draws priests from across the United States. What is taught at that assembly shapes how those priests understand their vocation, their relationship to Church authority, and the content they bring to the faithful in their parishes.
Sr. Duffy’s Teilhardian framework does not merely introduce heterodox cosmology into clerical formation but reshapes the priest’s relationship to the Church he serves. Original sin becomes an evolutionary growing pain. Redemption becomes a cosmological process. The Cross becomes “the royal road of universal progress.” The personal God of the Gospels becomes, in Teilhard’s own words, “the soul of the world.” The Church’s authority to define and guard the faith becomes an obstacle to be managed rather than a gift to be received.
The faithful who sit in those priests’ pews deserve to know what is being built, and on whose authority.
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