On its own, much less than people assume. As a proxy for several other things, considerably more.
Synagogue attendance is a poor single measure of Jewish life. People attend weekly and are otherwise uninvolved. People never attend and organise their whole social world around Jewish community. Using it as a shorthand for observance produces a lot of bad conclusions.
What it is actually a proxy for
Community. This is usually the real question. Do you want a Jewish community as part of your life, and would you want your children inside one? That can be delivered through a synagogue and it can be delivered through friends, a youth movement, a school, or a neighbourhood. The synagogue is one route to it, not the thing itself.
The shape of the week. Regular attendance structures a Saturday morning, usually with other commitments attached. That is a genuine difference in how a household runs, and it is what a partner will actually notice.
Belonging somewhere specific. Membership means a rabbi who knows you, people who show up when something happens, somewhere to mark a birth or a death. This matters most at the moments nobody plans for.
Where the real friction sits
Rarely in the hour itself. It sits in three places.
Saturday. If one person is out every Saturday morning and the other is not, that is a recurring split in the week. Fine if agreed, corrosive if resented.
The social world. Regular attendance usually comes with a set of relationships attached. A partner can find themselves at the edge of a community they did not choose, at a lot of events, knowing nobody.
Children. Whether they go, from what age, and what happens when they stop wanting to. This is the one that actually forces the issue, usually around year eight of a marriage.
The questions worth asking
- Do you want to belong to a specific community, or is Jewish life something you do privately and with family?
- If one of us goes regularly and the other does not, what does Saturday look like — for the next twenty years?
- Would you want the children to go? From what age? With whom?
- If you are the one who attends: do you want your partner there, or are you content going alone? Answer honestly.
- If you are the one who does not: are you comfortable being part of that community socially, even without the service?
That fourth question is the one that catches people. Plenty of people say they do not mind going alone and discover, years in, that they minded a great deal.
What usually works
Couples who handle this well tend to land somewhere specific rather than vague. One goes weekly, the other comes once a month and to anything that matters. Or both go rarely but are committed members and turn up for community occasions. Or one is heavily involved and the other is warmly welcomed without pretending to an interest they do not have.
What fails is leaving it unspoken and letting a default accumulate. Defaults set by inertia tend to produce resentment on both sides — one feels abandoned, the other feels judged.
Synagogue is one of twelve areas in the Jewish Home Vision tool, and the tool asks it separately from observance for exactly this reason.