The question of reconciling the biblical narrative of human origins with modern genetic data on the dangers of inbreeding (consanguinity) is one of the most challenging points of contact between science and religion. On one hand, the Book of Genesis describes the origin of all people from one couple — Adam and Eve, and later, after the Great Flood, from the family of Noah. On the other hand, modern genetics unambiguously demonstrates that consanguineous marriages significantly increase the risk of expressing harmful recessive mutations leading to hereditary diseases. Resolving this apparent contradiction lies in the interpretation of both sacred texts and scientific facts.

Genetic mechanisms of risk in inbreeding

From a scientific perspective, the danger of inbreeding is due to the distribution of recessive alleles — variants of genes that do not manifest in the presence of a dominant, healthy allele — within the population. Each person carries several such hidden, potentially harmful mutations. In a diverse population, the likelihood of two carriers meeting with the same recessive mutation is low. However, among close relatives with common ancestors, the genetic set is very similar. As a result, their offspring have a high probability of inheriting two copies of a harmful recessive allele (one from each parent), leading to the manifestation of hereditary diseases such as cystic fibrosis, phenylketonuria, or various forms of immunodeficiency.

Biblical paradigm and its theological interpretations

The biblical narrative, if taken literally, implies the inevitability of consanguineous marriages in the dawn of human history. The children of Adam and Eve (Cain, Abel, and Seth) could continue the lineage only by entering into relationships either with each other or, as some apocryphal interpretations suggest, with other "human daughters" not mentioned directly in the canonical text. A similar situation arises after the Flood, when all modern humanity originates from three pairs — the sons of Noah and their wives. For religious thought, this posed a serious challenge that was resolved in several ways. One approach asserts that Adam and Eve were created perfect, and their genome did not contain initially harmful mutations. Subsequent genetic errors accumulated gradually over many generations, as a result of the fall and the removal from the original ideal.

Hypothesis of initial genetic perfection and degeneration

According to this theological model, the first generations of people after Adam and Noah possessed a "pure" genome, in which either lethal recessive alleles were completely absent or their number was negligible. This made inbreeding safe in the early stages of human history. Over time, as mutations accumulated, the genetic burden increased, and by the time the Law of Moses was established, prohibiting consanguineous marriages (Leviticus 18), the need for such a prohibition became evident from a medical perspective, given from above. Thus, the divine prohibition is interpreted not only as a moral norm but also as an act of care for the physical health of the people.

Symbolic interpretation and the evolution of humanity

Another, more widespread approach in modern theology, suggests a non-literal reading of the first chapters of Genesis. In this paradigm, the story of Adam and Eve is understood as a theological and symbolic text revealing the relationship between God and humanity, rather than as a scientific report on the origin of the species Homo sapiens. In this context, Adam may be considered as a representative of the first human community endowed with consciousness and spirituality, rather than as the sole biological ancestor. This removes the genetic dilemma, as the original population of people could have been sufficiently numerous to avoid the negative consequences of inbreeding. In this case, the biblical text speaks of spiritual, rather than biological, unity of the human race.

Thus, the apparent conflict between genetics and the Bible turns out not to be insurmountable. It is resolved either through the acceptance of the model of initial genetic perfection and subsequent degeneration or through the symbolic interpretation of the sacred text, leaving room for scientific data on the evolution and genetic diversity of the human population. Both approaches recognize the authority of Scripture as well as the reality of the biological laws opened by science.

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