I've just finished reading what I consider to be a remarkable book. It's titled "Love Thy Body," and is authored by Nancy Pearcey. The book was written "to counter the pervasive hostility to the body and biology that drives today's headline stories." In the book Pearcey addresses the "two-tiered" or "two-storied" philosophy that separates values from facts and the body from personhood. She covers topics such as abortion, euthanasia, homosexuality, same-sex marriage, and transgenderism from a teleological perspective. Here's an excerpted excerpt frm the introduction,
“…Christianity is dualist because it holds that there exists both body and soul, matter and spirit. These two substances causally interact with one another, but neither one can be reduced to the other. The reality of the spiritual realm is important to defend today because the academic world is dominated by the philosophy of materialism (the claim nothing exists beyond the material world).”

“Yet Christians holds that body and soul together form an integrated unity – that the human being is an embodied soul. By contrast, personhood theory entails a two-level dualism that sets the body against the person, as though they were separate things merely stuck together. As a result, it demeans the body as extrinsic to the person – something inferiror that can be used for purely pragmatic purposes……”

“…even though the world is fallen and broken by sin, it still speaks of its Creator. We can ‘read’ signs of Gods’ existence and purposes in creation. This is called a teleological view of nature, from the Greek word telos, which means purpose or goal. It is evident that living things are structured for a purpose: Eyes are for seeing, ears are for hearing, fins are for swimming, and wings are for flying. Each part of an organ is exquisitely adapted to the others, and all interact in coordinated, goal-directed fashion to achieve the purpose of the whole….”

“If nature is teleological, and the human body is part of nature, then it is likewise teleological. It has built-in purpose part of which is expressed in the moral law. We are morally obligated to treat people in a way that helps them fulfill their purpose….”

“The implication is that the physical structure of our bodies reveals its clues to our personal identity. The way our bodies function provides grounds for our moral decisions. That’s why… a Christian ethic always takes into account the facts of biology, whether addressing abortion (the scientific facts about when life begins), sexuality (the facts about sexual differentiation and reproduction). A Christian ethic respects teleology of nature and the body….”

“In the two-story worldview [where the body is separated what it means to be a person], simply being a member of the human race is not enough to qualify for personhood. The baby in the womb has to earn the status of personhood by achieving a certain level of cognitive functioning – the capacity for consciousness self-awareness, autonomy, and so on.”
“Bioethicists who adopt personhood theory often claim to be scientific, yet the theory has no scientific support… Embryonic development is a continuous process, gradually unfolding the potentials that were built in from the beginning. The two-story concept of personhood is neither empirical nor scientific.”
Pearcey is a protege of Francis Schaeffer, for those of you familiar with his works (for those of you not familiar with his works I highly recommend his trilogy). Hers is an approach that examines views presuppositionally, the things tacitly assumed prior to the beginning of a line of reasoning or argument or course of action. I also recommend her book, "Total Truth."