Attendance at religious services has fallen sharply across much of the world, yet particular rituals persist among people who describe themselves as non-believers. The persistence points to what ritual actually does.
Ritual coordinates groups rather than transmitting doctrine
Ritual actions are typically synchronised, repeated and performed together, and those features are more prominent than any explanatory content.
Doing the same thing at the same time as other people has measurable effects on cooperation and on how strongly participants identify with the group.
Those effects do not depend on the participants agreeing about what the actions mean, which is why a ritual can survive substantial disagreement about its content.
It marks transitions that would otherwise be unmarked
Births, adulthood, marriage and death are changes in a person's position that other people need to recognise and respond to.
Ritual makes those changes public and dated, so that everyone involved knows the change has occurred and how to behave afterwards.
Secular societies have not produced widely adopted substitutes for most of these, which is a large part of why religious forms are still used by people outside the religion.
Prescribed action removes the burden of improvisation
At moments of crisis, particularly around death, people frequently do not know what to do or say, and the cost of getting it wrong feels high.
Ritual supplies a script, which allows participation without requiring anyone to invent an appropriate response under pressure.
This is one of the more commonly cited reasons for keeping funeral rites, and it operates independently of what participants believe about an afterlife.
Repetition creates continuity across time
Performing the same actions annually links a person to their own earlier performances and to previous generations who performed them.
That continuity is a form of identity maintenance, and it is the reason food, calendar and household rituals persist longest when belief recedes.
Practices in this category often migrate from religious observance into family custom without any moment at which the change is acknowledged.
What thins out first
When belief weakens, the elements that disappear earliest are those requiring assent to specific claims, while the embodied and social elements persist.
The result is the widely observed pattern of people who attend services at particular points in the year, or who keep dietary customs while rejecting the doctrine behind them.
That combination is often described as inconsistent, though it is coherent once ritual is understood as doing something other than expressing belief.