Otherwise, how do you expect a Jew, an Atheist and a Hindu* to operate under the same legal system? No joke; clearly someone in that crowd is badly, badly wrong about some of the most important assumptions in their life. It doesn't affect their ability to contribute and live properly. If we can't separate out people's irrelevant beliefs, the logical implications are not pretty. The reason this works is because we accept that people can be completely, catastrophically wrong about one thing and still muddle through as well as the rest of us at everything else.
* Edited. ty.