Most religions have some form of sacrifice alluded to in their theology. Sometimes this involves literal offerings—killing and burning animals, or destroying valuable objects. Other times it is “bloodless”: giving money, time, obedience, or the renunciation of pleasures through fasting, abstinence, or celibacy. In all these cases, the underlying idea is similar: something costly is offered up, with the hope of securing meaning, favor, purity, forgiveness, protection, or communal belonging.
There are also sacrificial motifs that move disturbingly close to human sacrifice. In the Abrahamic traditions, for example, the willingness of Abraham/Ibrahim to sacrifice his son is presented as a peak test of obedience—and in Islam it is commemorated annually in Eid al-Adha, the “Festival of Sacrifice,” in which animal sacrifice functions as a memorial of that story. And in Christianity, the theme of sacrifice is carried into the central story of Jesus: a dramatic moral and symbolic reframing of sacrifice into self-sacrifice, offered “for others.”
Sacrifice is, in my view, an extension of ordinary human ideas about reciprocity and gratitude—infused with magical thinking. In a community we do favors, give gifts, and care for one another. These behaviors can be altruistic, but they are also supported by norms of reciprocity. If one believes that a mystical power controls destiny, fertility, weather, health, wealth, or military success, it becomes psychologically “reasonable,” within that worldview, to give that power a gift—hoping for a return.
And once a person enters this mindset, the logic can become self-sealing. If you make sacrifices and misfortune still comes, you can conclude the offering wasn’t sufficient, wasn’t sincere enough, or wasn’t given with the right purity of heart—so you must increase it next time. If something good happens afterward, it feels like proof that the sacrifice worked, and should be repeated. In this way, practicing sacrifice can become an escalating brutal and destructive behaviour. The sacrificed animals—often the most vulnerable and least able to “consent” to the human story being told about them—do not get much say in the matter.
Another motivation for sacrificial rituals likely came from the brutal necessities of ancient life: hunting animals, or killing domestic animals for food. Most humans bond to animals easily, and it would be psychologically troubling to watch an animal struggle and suffer. Ritual can function as moral anesthetic: a way to consecrate violence, to assuage guilt, and to turn a grim necessity into a story of gratitude, order, and meaning.
Sacrifice can also be political performance. Public ritual can consolidate hierarchy (especially priestly hierarchy), display power, intensify fear, and signal unity. It is not hard to see how sacrifice functions as a kind of social technology: it makes shared belief visible and costly.
This is also where sacrifice connects to group psychology. Some scholars have argued that costly rituals—things you would not do unless you were committed—operate as signals that strengthen trust and cooperation within a group, partly by filtering out free riders. A community bound together by shared sacrifice can feel safer, warmer, and more morally serious to its members. But that same mechanism can harden boundaries and intensify suspicion of outsiders.
Speaking of reciprocity: it is a strongly selected trait to favor and help genetic relatives, sometimes even in self-sacrificial ways. If there is a person who has a trait that causes them to selectively help close relatives, then that trait will tend to persist in the family line, because it helps protect and propagate the very genetic network that carries it forward. This is a simple evolutionary logic: kin altruism increases the survival and reproductive success of the shared family “pool,” even when it costs the individual something in the short run.
But humans do not walk around calculating degrees of genetic relatedness. Instead, we rely on crude, fast heuristics — cues that, over most of human history, were often correlated with kinship and shared ancestry. People who live near each other, marry each other, and raise children together will, over generations, tend to share not only genes but also language, accent, customs, dress, and social norms. Conversely, people who look different, speak differently, or practice very different customs are often from a different village, tribe, or family network — and therefore are more likely to be less closely genetically related than the people who share your immediate cultural and familial world.
The mind has evolved to be slightly more generous, trusting, and self-sacrificing toward those who are more likely to be “one of us,” so it follows that it may also be less generous, more suspicious, or more emotionally distant toward those who feel like “not us.” These tendencies are not destiny, and they are not moral justification — but they are part of the psychological and evolutionary foundation of prejudice. These are precisely the sorts of inherited inclinations we must learn to recognize, challenge, and actively override.
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