Why Does Evil Exist? What Judaism, Christianity, and Islam Say

Judaism doesn't offer a single tidy answer to why evil exists — and that honesty is itself theologically significant. The Hebrew Bible (Tanakh) approaches evil from multiple angles: moral, cosmic, and existential.

Genesis 6:5 presents one of the starkest diagnoses in all of scripture: human beings are deeply, persistently inclined toward evil Genesis 6:5. This isn't a minor character flaw — it's described as the dominant orientation of the human heart. The rabbis developed this into the concept of the yetzer ha-ra (the evil inclination), which the Talmud (Berakhot 61a) describes as present in every person from birth. Crucially, the yetzer ha-ra isn't purely negative in rabbinic thought — the 4th-century midrash Genesis Rabbah (9:7) argues it's necessary for human ambition and creativity.

Ecclesiastes takes a more observational, almost philosophical stance. Qohelet notes that evil is common under the sun Ecclesiastes 6:1, and that a single fate — death — comes to all, while human hearts remain full of madness and evil throughout life Ecclesiastes 9:3. This is existential realism, not despair: it's an honest reckoning with the world as it is.

Isaiah 5:20 adds a moral dimension — evil persists partly because humans rename it, calling evil good and good evil Isaiah 5:20. The prophet Jeremiah raises the theodicy question directly, asking whether evil should be repaid for good Jeremiah 18:20, a lament that anticipates centuries of Jewish wrestling with suffering, culminating in post-Holocaust theology by thinkers like Elie Wiesel and Emmanuel Levinas.

Mainstream Jewish thought, from Maimonides' Guide for the Perplexed (12th century) to modern thinkers, generally holds that most evil is privative — the absence of good — or the result of human free will. God permits evil rather than causing it, though the tension between divine sovereignty and human suffering remains unresolved and is considered a legitimate, even holy, question.

Christianity inherits the Hebrew Bible's diagnosis of human evil but adds several theological layers: the doctrine of the Fall, the role of Satan, and the redemptive purpose of suffering through Christ.

The New Testament passage Romans 14:16 — "Let not then your good be evil spoken of" Romans 14:16 — reflects Paul's awareness that evil operates not just in dramatic acts but in the distortion of perception and reputation. It's a small verse, but it echoes Isaiah's warning about moral confusion Isaiah 5:20.

The dominant Christian explanation for evil's existence is the felix culpa tradition: Adam and Eve's free choice in the Garden introduced sin and death into creation (Genesis 3; Romans 5:12). Augustine of Hippo (354–430 AD) argued in his Confessions and City of God that evil has no independent existence — it's a corruption of good, a privatio boni. God didn't create evil; creatures with free will chose it.

Ecclesiastes 9:3, shared with Judaism, resonates deeply in Christian anthropology: the human heart is full of evil Ecclesiastes 9:3. This aligns with the Reformed doctrine of total depravity articulated by John Calvin (1509–1564), though Catholic and Arminian traditions emphasize that human nature is wounded rather than wholly corrupt.

There's genuine disagreement within Christianity about why God permits evil. Alvin Plantinga's 1974 God, Freedom, and Evil offers the influential Free Will Defense: God couldn't create free beings who always choose good without contradiction. C.S. Lewis similarly argued in The Problem of Pain (1940) that suffering is often the means by which God shapes character. Others, like John Hick (1966), propose a "soul-making" theodicy. The existence of natural evil — earthquakes, disease — remains the harder problem.

Islam addresses evil primarily through the framework of qadar (divine decree) and the concept of this world as a place of testing (ibtila). The Qur'an teaches that Allah created everything, and that apparent evil — hardship, loss, moral failure — serves purposes within His sovereign wisdom, even when those purposes aren't immediately visible to humans.

The Qur'an (Surah Al-Baqarah 2:155–157) states explicitly that God will test believers with fear, hunger, and loss, and that those who persevere with patience are promised mercy. Evil and suffering, in this view, are not signs of divine absence but of divine testing. The 8th-century scholar Hasan al-Basri emphasized that trials purify the believer's soul.

Islamic theology distinguishes between sharr (evil/harm) and sin. Moral evil arises from human free will and the whisperings of Shaytan (Satan), who was expelled from Paradise for refusing to bow to Adam (Surah Al-Kahf 18:50). Natural evil — disasters, illness — is understood as part of Allah's decree, the wisdom of which may be hidden from human understanding.

The Ash'ari school of Islamic theology (dominant in Sunni Islam, developed by Abu al-Hasan al-Ash'ari, d. 935 CE) holds that God creates all acts, including evil ones, but humans acquire moral responsibility through their choices (kasb). The Mu'tazilite school disagreed, arguing God cannot create evil because He is inherently just — a debate that shaped Islamic theology for centuries.

Importantly, Islam shares the Abrahamic concern about moral confusion: calling evil good is a form of corruption that the Qur'an repeatedly condemns (e.g., Surah Al-Ma'idah 5:100), echoing Isaiah's warning Isaiah 5:20.

Hebrew Scripture depicts evil as both pervasive and close to home: “the heart of the sons of men is full of evil” and all share one fate under the sun, so the problem of evil touches everyone in life and death Ecclesiastes 9:3.

Evil also flows from distorted human moral judgment—calling evil good and good evil—so confusion and inversion of values are themselves drivers of evil’s spread Isaiah 5:20.

The Torah and Prophets further portray human wickedness as arising from the inward thoughts and purposes of the heart, which God saw as continually evil before the flood, highlighting human responsibility for moral corruption Genesis 6:5.

At times, evil is experienced as recompense or catastrophe overtaking the arrogant, underscoring that consequences can arrive suddenly and beyond human power to avert, a theme the prophets deploy as warning and call to repentance Isaiah 47:11.

Prayers and wisdom texts acknowledge “days of evil,” urging courage and trust even when surrounded by iniquity and threat, which implies faithful endurance amid a broken world rather than a promise of immediate escape Psalms 49:5.

Christian teaching receives Israel’s Scriptures and likewise sees evil as a universal condition “under the sun,” with human hearts described as full of evil and all people sharing one mortal end, emphasizing the tragic reach of sin and death in the present age Ecclesiastes 9:3.

It also warns against moral inversion—calling evil good and good evil—because such confusion corrupts conscience and community, a danger the Church reads in continuity with the prophets Isaiah 5:20.

Practically, believers are admonished not to let genuine good be discredited as evil, which stresses responsible conduct and communal sensitivity so that righteousness isn’t undermined by scandal or carelessness Romans 14:16.

These strands cohere with the older witness that inner thoughts can be bent toward evil, pressing Christians to watch over the heart and resist sin’s spread in thought, word, and deed Genesis 6:5.

Not applicable. This question is in scope, but no Islamic scripture was retrieved; without Qur’anic or Hadith texts, I can’t provide a sourced Islamic answer.