The claim that a fetal human only acquires a soul at around 24 weeks rests on specific religious assumptions that cannot coherently ground abortion law or moral personhood. Appeals to souls, brain waves, or a supposed capacity to “choose for or against God” rely on theological premises that are neither universally shared nor logically consistent when applied to real-world cases.
Using brain waves at 24 weeks as a decisive marker fails as a legal or moral standard. Brain activity alone cannot determine who deserves protection, because many nonhuman animals—such as squirrels—have brain waves and conscious experiences that are more developed than those of a 24-week fetus, yet they are not granted human rights. If brain waves were sufficient for personhood, the standard would either grant human rights to animals or collapse under its own inconsistency.
Shifting the criterion to the capacity to choose for or against God fares no better. Newborn infants plainly lack the ability to make such a choice, yet it is universally recognized that killing newborn humans is wrong. Any rule that would justify killing newborns reveals itself as morally unacceptable. A standard for personhood must protect all humans equally, not exclude some humans while potentially including animals.
In short, if a proposed threshold for having a soul or moral worth would either deny protection to newborn humans or extend it to animals, it cannot serve as a coherent basis for deciding who counts as a person under the law. Religious speculation about souls does not justify killing innocent human beings at any stage of development.
Key Takeaways
Religious thresholds are an unstable basis for law: Claims about souls, brain waves, or choosing God rely on theological assumptions that cannot justify killing innocent humans in a pluralistic society.
Brain waves are not a consistent standard for personhood: Animals can have more advanced brain activity than a 24-week fetus, yet they are not treated as human persons, revealing the inconsistency.
Choice-based criteria exclude newborns: If moral worth depends on choosing for or against God, then newborn infants would be killable—which is clearly unacceptable.
Equal human protection requires rejecting arbitrary cutoffs: Any standard that either includes animals or excludes newborn humans fails; the only coherent alternative is equal protection for all human beings, regardless of developmental stage.