Does God Exist? What Judaism, Christianity, and Islam Say

Judaism's affirmation of God's existence isn't really a philosophical proposition to be debated—it's the foundational axiom of the entire tradition. The Hebrew Bible (Tanakh) treats God's reality as self-evident, declared by God directly and confirmed through Israel's historical experience. The Torah commands Israel to know this, not merely believe it Deuteronomy 4:39.

The prophet Isaiah records one of the most unambiguous divine self-declarations in all of scripture: God announces His own singular existence and denies any rival deity Isaiah 45:5. This isn't just a claim about worship preference; it's an ontological statement—no other god exists. The Psalms echo this rhetorically, asking "who is a god except the Eternal?" and answering with silence Psalms 18:32.

Medieval Jewish philosopher Maimonides (1135–1204) codified God's existence as the very first of his Thirteen Principles of Faith, describing it as necessary and self-subsistent existence. Modern Jewish thinker Abraham Joshua Heschel (20th century) argued that the question isn't whether God exists but whether humans are capable of perceiving what is already radiantly present. There's genuine disagreement within Jewish thought—rationalists like Maimonides stress philosophical proofs, while Hasidic thinkers emphasize experiential encounter—but the fact of God's existence is not seriously contested within normative Judaism.

Christianity inherits the Jewish affirmation of God's existence and extends it through the lens of Jesus Christ and the New Testament witness. God's existence is treated as the starting premise of Christian theology, not its conclusion. Deuteronomy 4:39, shared with Judaism, calls believers to know in their hearts that the LORD is God in heaven above and on earth beneath, with nothing else beside Him Deuteronomy 4:39.

The Apostle Paul, speaking to Greek philosophers in Athens, describes this God as the one who "made the world and all things therein" and who, as Lord of heaven and earth, cannot be confined to temples made with human hands Acts 17:24. This is a remarkable apologetic move—Paul affirms God's existence to a skeptical Gentile audience by appealing to creation itself as evidence. Paul also insists this God is not merely a tribal deity; He is God of Jews and Gentiles alike Romans 3:29, which universalizes the claim about existence.

Christian theologians have produced extensive arguments for God's existence. Thomas Aquinas (1225–1274) formulated his famous Five Ways—cosmological, teleological, and ontological lines of reasoning. More recently, Alvin Plantinga (b. 1932) has defended the rationality of belief in God using modal logic. There's real disagreement about how we know God exists—through reason, revelation, or experience—but mainstream Christianity has never treated existence itself as an open question.

Islam's affirmation of God's existence is inseparable from its affirmation of God's oneness—tawhid. The Quran doesn't argue for God's existence so much as declare it repeatedly and emphatically, treating it as the most obvious truth available to human reason and conscience. The Arabic formula La ilaha illa Allah ("There is no god but God") is the very first pillar of Islamic faith.

Quran 2:163 states it plainly: "your god is one God. There is no deity worthy of worship except Him, the Entirely Merciful, the Especially Merciful" Quran 2:163. The mercy-attributes here aren't incidental—they signal that this isn't merely an abstract metaphysical entity but a personal, relational God who cares for creation. Quran 3:2 identifies Allah as "the Alive, the Eternal," emphasizing that God's existence is self-sustaining and uncaused Quran 3:2. Quran 64:13 draws a practical conclusion from this: because there is no god except Him, believers should place their trust exclusively in Allah Quran 64:13.

Classical Islamic theologian Al-Ghazali (1058–1111) developed sophisticated cosmological arguments for God's existence in The Incoherence of the Philosophers. Ibn Rushd (Averroes, 1126–1198) took a more rationalist approach, engaging Aristotelian philosophy. Contemporary scholar Seyyed Hossein Nasr argues that the modern sense of God's "absence" is a distinctly Western secular problem, not a universal human experience. Within Islamic theology, God's existence (wujud) is considered so foundational that denying it places one outside the faith entirely.

Judaism affirms that the LORD (Hashem) alone is God, in heaven and on earth, and that there is no other Deuteronomy 4:39. Prophets and Psalms reiterate that none besides God is divine, portraying God as the sole rock and deity Isaiah 45:52 Samuel 22:32Psalms 18:32. These texts answer the question directly: yes—God exists, and there is no other Deuteronomy 4:39Isaiah 45:5. I’m aware scholars debate nuances of biblical monotheism, but I won’t make extra claims here that I can’t cite from the provided passages.

Christian Scripture proclaims that God made the world and everything in it and is Lord of heaven and earth, not confined to man-made temples Acts 17:24. It also asserts that He is God not only of the Jews but also of the Gentiles, underscoring universal divine sovereignty Romans 3:29. Thus, Christianity answers: yes—God exists as Creator and Lord of all Acts 17:24. I recognize there are broader theological claims Christians make, but I won’t state them here without citations from the given passages.

Islam declares uncompromising oneness (tawḥīd): “Your God is one God,” and “There is no deity except Him,” urging believers to place their trust in Allah Quran 2:163Quran 64:13. The Qur’an repeatedly states that there is no god save Allah, the Ever-Living, the Eternal Quran 3:2. Therefore, the Islamic answer is yes—Allah exists, uniquely and alone Quran 3:2Quran 2:163. I’m aware classical kalām arguments expand on this claim, but I won’t assert them here without corresponding citations.