The shortest honest answer is this: it depends what you mean by "need," what you mean by "believe," and what you mean by "Jewish."
That sounds slippery, but it is the only way to stay accurate.
Judaism is a religion. It is also a people, a culture, a legal tradition, a memory project, and a family inheritance. Once you see that, the category mistake becomes obvious. Jewish identity and Jewish theology overlap, but they are not the same thing.
Jewish status is not the same as private belief
Across most of Jewish history, a Jew was understood first as a member of the Jewish people by birth or conversion, not as a person who signed onto a creed.
That does not mean belief was irrelevant. It means identity was communal before it was confessional.
My Jewish Learning's essay "Must a Jew Believe in God?" makes this point sharply. It notes that rabbinic Judaism emphasized action, commandment, and communal belonging more than formal doctrinal statements. The article also notes that Maimonides, in the Middle Ages, made a famous and consequential move by insisting that certain beliefs, including beliefs about God, were essential. But that was itself a development inside Judaism, not the only Jewish model that ever existed.
So if the question is, "Can a person born Jewish stop believing in God and still be regarded as Jewish by many Jewish communities?" the practical answer is yes.
The harder question is what kind of Jewish life remains after that.
Judaism is still a God-centered tradition
It would be dishonest to pretend otherwise.
The Torah, the prayer book, classical theology, and halakhic life all assume that God matters. Traditional liturgy speaks in God's voice, to God, and about God's commandments. Classical Judaism is not secular humanism in costume.
My Jewish Learning puts it well: normative Judaism has always been God-centered, even if some thinkers made belief less central than practice. That means unbelief may not erase Jewish identity, but it does create tension with large parts of inherited Jewish religious life.
This is why different Jewish thinkers answer the question differently. Some argue Judaism without God drains the tradition of its source. Others argue that Jewish law, ritual, memory, and ethical practice can still carry real force even when a person cannot affirm supernatural claims in a straightforward way.
Both positions exist inside modern Jewish debate because both describe something real.
The modern Jewish world is much less theistic than many outsiders assume
Pew's 2020 survey is useful here because it measures what American Jews actually say, not what institutions wish they said.
Pew found that 27 percent of U.S. Jewish adults identify religiously as atheist, agnostic, or "nothing in particular" while still considering themselves Jewish in some other way. The survey also found that just 26 percent of U.S. Jews say they believe in "God as described in the Bible," while 50 percent say they believe in some other spiritual force. Among Jews of no religion, 44 percent say they do not believe in any higher power at all.
And yet Jewish identity remains strong for many of these same people. Three-quarters of U.S. Jews say being Jewish is at least somewhat important to them. Most do not define Jewishness primarily as religion alone. Many describe it through ancestry, culture, ethics, and collective memory.
That is not a fringe reality. It is a central fact of American Jewish life.
Why nonbelieving Jews still keep Jewish rituals
This part often confuses people from more creed-based religious traditions.
Why light Shabbat candles if you do not believe God commanded it? Why fast on Yom Kippur? Why hold a Passover seder, sit shiva, say Kaddish, or keep a mezuzah on the door?
Because ritual does more than signal belief.
It binds families across generations. It marks time. It gives grief a structure. It lets people speak in a Jewish grammar at moments of joy and disaster. It places a person inside a calendar, a table, a community, and a long memory.
Pew helps explain this too. Many American Jews say the most essential parts of Jewish identity are remembering the Holocaust, leading a moral and ethical life, working for justice and equality, and continuing family traditions. Observing Jewish law ranks much lower for the average respondent, but the sense of Jewish belonging does not vanish with lower observance.
That helps explain why a secular Jew may still care very much about Passover, family recipes, Hebrew songs, and Yom Kippur, even if that Jew cannot say honestly, "I believe in the God of the Bible."
Different movements answer the question in different ways
Orthodox Judaism generally draws the sharpest theological lines, but even there the issue is not simple. An Orthodox rabbi may say that disbelief is wrong, serious, or spiritually dangerous while still acknowledging that a born Jew remains Jewish.
Liberal Judaism often approaches the question differently.
Reconstructionism offers one of the clearest examples. Reconstructing Judaism says God is not primarily something to be "believed in" as an external being, but something experienced in daily life and made manifest through human action. That does not erase God-language, but it changes what assent means.
Humanistic Judaism goes further. The Society for Humanistic Judaism says its movement celebrates Jewish life without religious prayer or appeals for divine intervention and explicitly offers a Jewish home for people who are atheist, agnostic, secular, or "just Jewish." In other words, it builds Jewish belonging without requiring theism at all.
These movements are not identical, but together they show that modern Jewish life includes real institutional homes for Jews who cannot affirm traditional supernatural belief.
So what is the honest answer?
If the question is legal or social identity, many Jews would answer no. A person can be Jewish without believing in God.
If the question is whether disbelief fits comfortably inside the traditional prayer book, the answer is less comfortable. Much of inherited Jewish worship assumes God, addresses God, and depends on covenant language that an atheist may not be able to say literally.
If the question is whether Judaism as a civilization can survive among people who are uncertain, skeptical, or nonbelieving, the evidence says yes, at least for quite a long time. Jewish history is full of people who were held by practice, argument, memory, humor, and loyalty long after metaphysical certainty weakened.
Whether that kind of Judaism can fully reproduce itself across many generations is a different question. Jewish thinkers disagree sharply there, and the disagreement is serious.
But the first question is easier than people make it.
You do not need to believe in God in exactly the same way, or perhaps at all, to remain part of the Jewish people.
You do, however, need to decide what is left of Jewish life for you once belief changes.
That is where the real argument begins.