What Religions Do Not Believe in God? A Three-Faith Perspective

Judaism is unambiguously theistic — belief in one God is the foundation of the entire tradition. The Hebrew Bible repeatedly frames disbelief as a moral and spiritual failure. When the Israelites doubted in the wilderness, the text frames it as a direct rejection of God's demonstrated power Deuteronomy 1:32. Psalm 78 similarly characterizes the people's lack of trust as a failure to believe in God's saving acts Psalms 78:22.

The commandment in Psalm 81 is direct: no foreign deity is to be worshipped or even acknowledged as a rival to the God of Israel Psalms 81:9. Jewish philosopher Maimonides (1135–1204) codified belief in God's existence as the very first of his Thirteen Principles of Faith, making atheism categorically incompatible with normative Jewish practice. That said, modern Jewish denominations — particularly Reconstructionist Judaism, developed by Mordecai Kaplan in the 20th century — have explored naturalistic or non-personal conceptions of God that some critics argue border on non-theism.

Christianity holds belief in God as absolutely non-negotiable. The New Testament doesn't just encourage belief — it treats disbelief as a kind of spiritual alienation. John 8:47 draws a sharp line: those who don't hear God's words are, by definition, not 'of God' John 8:47. This isn't a peripheral claim; it's central to Johannine theology and was cited extensively by Augustine of Hippo (354–430) in his writings on grace and election.

Interestingly, James 2:19 acknowledges that even demons believe in one God and tremble James 2:19, suggesting that mere intellectual assent isn't sufficient — true faith involves moral transformation. Paul's letter to the Romans raises the question of what happens when some within a community don't believe, but he's clear that human unbelief doesn't negate God's faithfulness Romans 3:3. The question of who truly 'believes' has generated enormous theological debate, from Calvinist predestination to Arminian free will, but no mainstream Christian tradition embraces atheism or non-theism.

Non-theistic religious movements sometimes labeled 'Christian atheism' — briefly prominent in the 1960s through figures like Thomas J. J. Altizer — remain deeply marginal and are rejected by virtually all Christian denominations as incompatible with the faith.

Islam is perhaps the most emphatic of the three Abrahamic faiths in its insistence on monotheism (tawhid). The Quran repeatedly characterizes those who do not believe as a distinct and spiritually lost category of people. Surah 43:88 records a lament over a people who simply will not believe Quran 43:88, and Surah 4:65 conditions true faith on complete submission — not merely verbal acknowledgment Quran 4:65.

Islamic theology, particularly as developed by scholars like Al-Ghazali (1058–1111) and Ibn Taymiyyah (1263–1328), treats kufr (disbelief) as the gravest spiritual error a person can commit. The concept of shirk — associating partners with God — is considered even worse than outright atheism in some classical formulations, because it corrupts the concept of God rather than simply denying it. Non-theistic philosophies have no recognized place within orthodox Islamic thought, and no major Islamic school of jurisprudence accommodates atheism as a valid worldview.