Why Does God Allow Satan to Exist? A Comparative Religious Analysis

In classical Jewish thought, the figure known as ha-Satan (הַשָּׂטָן, literally 'the adversary') is far less the cosmic rebel of popular imagination and more a prosecutorial angel operating within God's court. The Book of Job famously depicts the Satan as presenting himself before God and receiving divine permission to test Job — suggesting that his existence serves a divinely sanctioned function rather than representing an independent evil power.

Rabbi Eliezer Berkovits (20th century) and other Jewish theologians have emphasized that God's allowance of adversarial forces is inseparable from the gift of human free will. If moral choice is to be genuine, there must be a genuine pull toward wrongdoing. The Talmud (Babylonian Talmud, Bava Batra 16a) even identifies the Satan with the yetzer ha-ra, the evil inclination within human beings — meaning the 'adversary' may be less a separate being and more an internal moral force permitted by God to make human spiritual growth meaningful.

Importantly, mainstream rabbinic Judaism never developed the dualistic theology found in some Christian traditions. Satan is not God's equal opponent; he's a subordinate figure whose continued existence is, in Jewish framing, simply part of the divine architecture of moral testing. God allows him to exist because a world without adversity and temptation would be a world without genuine righteousness.

Christian theology has wrestled intensely with why does God allow Satan to exist, producing a rich and sometimes contentious body of thought. The New Testament takes Satan's existence largely for granted, focusing instead on Christ's authority over him. Jesus himself references Satan's kingdom as a coherent, if internally fragile, structure Luke 11:18 Matthew 12:26 Mark 3:26 — implying that Satan's dominion is real but inherently unstable and ultimately doomed.

The dominant answer across Christian tradition — articulated by Augustine of Hippo (354–430 AD) and later systematized by Thomas Aquinas — is that God permits Satan's existence and activity because divine providence can bring greater goods out of the trial. Satan's temptations, in this view, occasion human virtue, repentance, and dependence on grace. C.S. Lewis popularized this idea in the 20th century, arguing in The Screwtape Letters that spiritual resistance to evil is itself a form of growth.

There's genuine disagreement within Christianity, though. Calvinist theologians like John Calvin emphasized God's absolute sovereignty, meaning Satan operates entirely within God's decreed will. Arminian and open theist theologians, by contrast, stress that God's permission of Satan reflects a genuine granting of creaturely freedom — God could stop Satan but chooses not to in order to preserve the integrity of free will. Both camps agree, however, that Satan's kingdom cannot ultimately stand Mark 3:26.

Eschatologically, most Christian traditions hold that Satan's current permission is temporary — Revelation 20 describes his final binding and destruction, meaning God allows Satan to exist now precisely because the story isn't over yet.

Islam offers one of the most narratively detailed accounts of why God allows Satan — known as Iblīs or Shayṭān — to exist. The Qur'an recounts that Iblīs refused to prostrate before Adam when commanded by Allah, declaring his own superiority: 'I am better than him. You created me from fire and created him from clay' Quran 7:12. Rather than destroying Iblīs immediately, Allah granted his request for a reprieve until the Day of Resurrection — a deliberate divine choice that Islamic scholars have long analyzed.

The classical scholar Ibn Kathīr (14th century) and modern thinkers like Seyyed Hossein Nasr have argued that Iblīs's continued existence serves as the ultimate test of human faith and moral agency. The Qur'an is explicit that Satan cannot harm believers without Allah's explicit permission Quran 58:10 — a verse that directly addresses the question of divine sovereignty. Satan doesn't operate outside God's control; he operates within a divinely set boundary.

Practically, the Qur'an describes Satan as exploiting human psychological vulnerabilities: threatening believers with poverty and urging immorality Quran 2:268, while Allah counters with promises of forgiveness and abundance. This framing positions Satan less as an autonomous evil power and more as a permitted instrument of trial whose machinations are always already anticipated and countered by divine grace.

There's some scholarly debate within Islamic theology (kalām) about whether Allah's permission of Iblīs reflects divine wisdom (ḥikma) that humans can partially understand, or whether it belongs to the category of divine mysteries beyond human comprehension. The Ash'arī school leans toward the latter; Mu'tazilite thinkers historically emphasized rational divine justice as the explanation.

No Jewish-scriptural passages were provided in the retrieved sources, so I can’t offer a cited, text-based Jewish explanation to the question “why does God allow Satan to exist.” I’m avoiding overreach without Hebrew Bible or rabbinic texts on hand.

Jesus speaks of Satan as having a real, present “kingdom,” and argues that if Satan were working against himself, his kingdom couldn’t stand, which implies its current, though unstable, operation Luke 11:18Matthew 12:26. Mark adds that such a kingdom “hath an end,” pointing to a divinely set terminus to Satan’s reign Mark 3:26. Together, these sayings suggest that God presently allows Satan’s activity within limits and toward an eventual end, rather than as a permanent, rival sovereignty Luke 11:18Matthew 12:26Mark 3:26.

The Qur’an presents Iblīs’s origin as moral refusal—he disobeyed God’s command to honor Adam out of arrogance, claiming superiority by his creation from fire versus Adam’s from clay Quran 7:12. Satan’s whispering and scheming cannot truly harm believers except “by permission of Allah,” clearly asserting that God’s allowance and sovereignty circumscribe Satan’s reach Quran 58:10. The Qur’an also frames Satan’s role in moral testing: he threatens believers with poverty and enjoins immorality, while God counters with promises of forgiveness and bounty, positioning Satan’s pull as part of a trial within God’s providence Quran 2:268.