How 19th-Century Science Challenged Religious Beliefs

The 1800s saw scientific discoveries that fundamentally reshaped how many understood creation, humanity's origins, and the authority of religious texts.

By Garret Merkley · Explainer · Jun 5, 2026

Branched from The Rise of New Religious Movements in the 19th Century

Quick take

19th-century science, particularly geology and evolutionary biology, introduced ideas that conflicted with literal interpretations of religious texts.
Charles Lyell's geology suggested Earth was millions of years old, challenging a young Earth creation.
Charles Darwin's theory of evolution proposed natural selection, questioning the special creation of species and humans.
These discoveries forced religious institutions to re-evaluate scripture, leading to new theological interpretations and ongoing debates.

The 19th century was a period of profound scientific advancement that introduced theories and evidence directly contradicting long-held religious doctrines, particularly those based on a literal reading of the Bible. These challenges primarily centered on the age of the Earth, the origin of species, and the historical accuracy of scripture, compelling religious thinkers to adapt or defend their beliefs.

Deep Time: Geology and Earth's Ancient Past

Before the 19th century, a common religious belief, derived from biblical genealogies, held that the Earth was only a few thousand years old. However, pioneering geologists like Charles Lyell, with his work "Principles of Geology" (starting 1830), presented compelling evidence for uniformitarianism. This theory argued that the geological processes shaping Earth today (erosion, sedimentation, volcanic activity) have operated consistently over immense spans of time. The sheer scale of geological formations and the slow rates of these processes implied an Earth millions, even billions, of years old, directly undermining the young-Earth timeline.

Natural Selection: Darwin and the Origin of Species

Perhaps the most impactful scientific challenge came from biology. Charles Darwin's "On the Origin of Species" (1859) introduced the theory of evolution by natural selection. Darwin proposed that all life forms share a common ancestor and have diversified over vast periods through a process where individuals with advantageous traits are more likely to survive and reproduce. This theory challenged the religious doctrine of special creation—the idea that each species was individually created by God in its present form—and raised profound questions about humanity's unique place in creation as distinct from other animals.

Biblical Criticism and Textual Analysis

Beyond the natural sciences, the 19th century also saw the rise of modern biblical criticism. Scholars began applying historical, literary, and textual analysis methods to the Bible, treating it not just as a divinely inspired text but also as a collection of human-authored documents. This critical approach questioned the literal accuracy of certain narratives, identified different authors and redaction processes within biblical books, and explored the historical contexts of their composition. While not a scientific discovery in the same vein as geology or evolution, it was a scholarly method that challenged traditional views of biblical inerrancy and divine authorship, contributing to the broader intellectual ferment.

These scientific and scholarly developments were significant because they forced a re-evaluation of fundamental religious tenets. They sparked intense debates, leading some to reject science in favor of literal interpretations, others to seek reconciliation by interpreting scripture allegorically or metaphorically, and still others to adapt their theology to incorporate scientific understanding. This period laid the groundwork for the ongoing dialogue between science and faith, shaping modern religious thought and contributing to the rise of secularism in some quarters.

Was Charles Darwin's theory the only scientific challenge to religion in the 19th century?

No, while Darwin's theory of evolution was hugely impactful, geological discoveries about the Earth's age (deep time) were equally significant and began challenging traditional timelines even before Darwin published his work. Biblical criticism also played a crucial role by questioning the literal interpretation of scripture.

Did all religious people reject these new scientific ideas?

Not at all. While some staunchly rejected the new scientific findings, many religious thinkers and institutions sought ways to reconcile their faith with science. This often involved reinterpreting biblical narratives metaphorically rather than literally, or seeing scientific processes as expressions of divine will.

What was the main point of conflict between science and religion during this era?

The primary conflict arose from the clash between scientific evidence, particularly regarding the age of the Earth and the origin of species, and the literal interpretation of creation narratives found in religious texts, especially the Book of Genesis. The idea of a young Earth and the special creation of each species were directly challenged.

Did these scientific discoveries prove that God doesn't exist?

No. Scientific discoveries provide explanations for natural phenomena and the physical world. They challenged specific religious *interpretations* and doctrines about how creation occurred, but they did not, and cannot, directly address the existence of God, which remains a question of faith and philosophy.

Sources

Lyell, Charles. Principles of Geology. 1830.
Darwin, Charles. On the Origin of Species. 1859.