Catholic scientists meet to discuss identical twins, AI, and the unity of truth
Over 130 Catholic scientists gathered June 5–7 at Mundelein Seminary for the Society of Catholic Scientists’ ninth annual conference, discussing faith‑science integration. Presenters explored topics ranging from the history of science, the moral dilemma of identical twins, AI’s role, to the beauty of mathematical discoveries. Nuno Castel‑Branco highlighted St. Nicolas Steno’s conversion and scientific legacy, while Maureen Condic offered a bioethical solution to the twin problem. The conference aimed to dispel myths that faith and science oppose each other, and all talks were made available via a recorded livestream. The event underscored the unity of truth and the Catholic scientific community’s engagement with contemporary scientific questions.
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The ninth annual Society of Catholic Scientists (SCS) conference gathered more than 130 Catholic researchers at Mundelein Seminary, Illinois, from June 5‑7, 2026. Attendees explored how faith and science converge on topics ranging from the ethics of identical twins to artificial intelligence and the philosophical implications of Gödel’s incompleteness theorem, emphasizing a unified pursuit of truth 1 2.
The SCS convened to counter the misconception that science and religion are opposed. Presentations and informal discussions highlighted the historical partnership between Catholicism and scientific inquiry, and all talks were streamed live for broader access 1 2.
Nuno Castel‑Branco recounted the life of St. Nicolas Steno, a 17th‑century anatomist‑turned‑bishop whose conversion illustrated how scientific curiosity can lead to deeper theological insight 1 2.
Maureen Condic proposed that the splitting of an embryo creates a second individual through a process akin to asexual reproduction, thereby preserving the dignity of each person from conception onward 1 2.
Ignasi Rosell invoked John Henry Newman’s vision of the university as a place where “truth is one,” arguing that science and theology together seek a single, coherent understanding of reality 1 2.
Two separate talks examined trustworthy scientific inference in the age of AI and positioned machine intelligence within Aristotle’s “Great Chain of Being,” suggesting a hierarchical view of souls and cognition 1 2.
Gregory F. Johnson discussed Gödel’s incompleteness theorem, describing mathematics as an “infinite realm” that reflects God’s abstract creation alongside the material world 1 2.
The conference showcased the expansion of international chapters, with Spain’s chapter now the second‑largest after the U.S. SCS members have launched projects such as the high‑school textbook Faith, Science, and Reason and a training program that equips scientists to lecture on the unity of faith and science 1 2.
Participants repeatedly described the gathering as interdisciplinary, inspiring, and unlike conventional scientific meetings, emphasizing the value of dialogue among believers across diverse fields 1 2.
Explore Catholic doctrines on truth unity in science and ethics
Catholic teaching holds that there is one truth—grounded in God—and therefore there can be a genuine harmony between scientific inquiry, philosophical reasoning, and theological reflection. This harmony does not mean identity between fields; rather, it means that when each discipline follows its proper methods, truth cannot ultimately contradict truth, while ethics remains non-negotiable because science and technology are ordered to the human person and must respect moral norms.
Catholic doctrine begins with a theological claim: God is the norm of all truth, and human beings have a moral obligation to seek truth—especially in what concerns God and the Church. The Catechism summarizes this obligation as flowing from the human person’s dignity: “All men are bound to seek the truth, especially in what concerns God and his Church, and to embrace it and hold on to it as they come to know it.”
This establishes an important link between truth and ethics: truth is not merely information, but also integrity—how a person lives and speaks. The Catechism teaches that the Eighth Commandment forbids “misrepresenting the truth,” and that offenses against truth are “fundamental infidelities to God” that undermine the covenant.
More deeply, the Catechism connects truth to a moral and spiritual life: God’s Word is truth, Jesus is “the Truth,” and disciples are called to “live in the truth.”
In this framework, ethics is not an external add-on to knowledge; it is one of the ways truth is safeguarded in human conduct.
A key Catholic principle is that truth is unified, but the routes to truth are diverse. Pope John Paul II articulates this by distinguishing “two different orders of knowledge which cannot be superimposed on each other,” even while insisting they can engage in constructive dialogue.
Accordingly, faith and science are not in a war if their methodological integrity is respected. John Paul II states: if the distinction between the orders is respected and both science and theology proceed according to their proper principles, “there is no fear that they will reach contradictory results.”
He adds an explicit rationale: “both reason and faith derive from the same divine source of all truth.”
This “unity without fusion” appears even in the Church’s vision of the relationship between science and religion. In a letter to Fr. George Coyne, John Paul II explains that the unity sought “is not identity”: “The Church does not propose that science should become religion or religion science.” Rather, “unity always presupposes the diversity and the integrity of its elements,” and reducing one to the other destroys true harmony.
Catholic theology is described as having a criterion precisely aimed at unity: it integrates multiple enquiries and methods into the unified project of intellectus fidei (reasoning that seeks understanding of faith).
This integration is paired with respect for the proper methods of other sciences and openness to scientific dialogue.
Catholic doctrine affirms that science has its own methodological character and right to operate as science, but it places a moral boundary on what scientific autonomy can legitimately mean.
The Catechism explicitly rejects “moral neutrality” in scientific research and its applications:
“It is an illusion to claim moral neutrality in scientific research and its applications.”
It also warns that “guiding principles cannot be inferred from simple technical efficiency,” nor from usefulness to some “at the expense of others,” nor from prevailing ideologies.
Instead, it states a positive principle: science and technology “require unconditional respect for fundamental moral criteria” and must be “at the service of the human person… in conformity with the plan and the will of God.”
The Congregation for the Doctrine of the Faith reiterates this in bioethics terms. It “recognizes the autonomy of the sciences and of technology,” but insists that for them to serve the human person, they must follow “the fundamental criteria of morality.”
It then quotes the Catechism’s teaching about science/technology being “ordered to man” and needing moral criteria because they “by their very nature require unconditional respect for fundamental moral criteria.”
John Paul II gives a particularly sharp formulation about the limits of scientific autonomy. He says: “The autonomy of science ends at the admission of evil in the research, the product or the effect.”
He connects this to conscience and to the need for morally formed scientists, not merely technically trained researchers: universities must form “ethical consciences,” because “the mystery of wisdom resides in the ethically formed conscience.”
John Paul II also addresses a social mechanism that threatens truth and ethics in science: unhealthy competition can shift research away from moral responsibility toward “predetermined goals” and “the interests of public demand,” even if that entails “the violation of inalienable human rights.”
In that perspective, “the demands of truth give way to the so-called ‘law of the market-place,’” which can lead to manipulation of truth and abandonment of basic ethics.
Hence the explicit ethical recommendation: scientists must have courage to reject what is “scientifically feasible but not morally licit.”
In the same vein, John Paul II argues that respecting moral norms is not a threat to knowledge but part of the proper search for it. He insists that the “only correct way to seek the truth” is to proceed with a “methodological inquiry in a truly scientific way while respecting moral norms.”
He adds that the “acceptance of good and evil” is essential to the honest aspiration to know.
A practical implication follows: ethics is not merely downstream, after scientific conclusions; rather, it shapes the permissibility of methods, and even what can count as a legitimate object of research depending on moral norms.
Catholic moral doctrine treats truthfulness as a virtue governing both speech and action, tied to justice and charity.
The Catechism defines “truthfulness, sincerity, or candor” as guarding against duplicity, dissimulation, and hypocrisy while being true in deeds and words.
It also links truthfulness to social trust: “Men could not live with one another if there were not mutual confidence that they were being truthful to one another.”
Truth gives others their due. The Catechism emphasizes that truthfulness keeps “to the just mean between what ought to be expressed and what ought to be kept secret,” involving both honesty and discretion.
This frames truth as an obligation of justice: “as a matter of honor, one man owes it to another to manifest the truth.”
When these ethical principles are brought back into research contexts, they support the Church’s insistence that scientific work and its applications are morally bound. The Catechism explicitly states that science/technology must respect moral criteria and serve the human person in their “true and integral good.”
Thus, a doctrine of ethical truthfulness implies that scientists are accountable not only for factual accuracy but also for moral honesty: not concealing wrongdoing, not distorting method, not manipulating outcomes for unjust ends.
A further Catholic doctrine is epistemic discipline: the Church counsels caution when scientific “hypotheses” are treated as if they could override revealed doctrine.
From Humani generis, the relevant principle is that Catholic teaching must not admit opinions opposed to doctrine revealed by God, especially when they involve conjectural views: when such conjectures oppose doctrine, “their demand can in no way be admitted.”
This does not deny that science can propose hypotheses; it warns that hypotheses cannot be promoted to a level of authority that contradicts faith.
In other words, Catholic unity is not achieved by erasing distinctions; it is achieved by letting each domain keep its proper scope—faith does not become science, and science does not become a substitute for faith, while both remain ordered to truth.
Catholic doctrine supports a coherent account of truth unity in science and ethics: one truth from God, acknowledged through distinct “orders of knowledge,” pursued by proper methods without forcing identity between faith and science.
At the same time, autonomy of science is real but morally bounded: research cannot claim moral neutrality, must respect fundamental moral criteria, and must be at the service of the human person’s integral good.
Finally, ethical truthfulness is not optional: it is a virtue rooted in justice and covenant fidelity, requiring honesty in word and deed and rejecting duplicity, dissimulation, and hypocrisy.