The nub of the questions that arise here are, however, rarely unpicked from the general questions motivating particular discussions and decisions. What I mean here is that the nature of citizenship should be being discussed, not particular religions and certainly not religions that happen to be minorities in a given place. Citizenship of a country with a broadly republican (in the Kantian sense) notion of itself should not be being defined in terms of whether people are adherents of a particular religion or whether, as members of this religion, they decide to adopt particular types of clothes or worship in certain structures. It should rather concern living in a way that does not conflict with the normative structure of republican governance.
However, putting the point this way can, and often clearly does, cause confusion. In France, in particular, it appears that the notion of the republic is bound up with the celebration of distinct values (particularly, since the beginning of the 20th century, secular ones) that are thought to be violated by the adoption of certain styles of clothing in public or the wearing of certain religious symbols. This conception of republicanism is far removed from the Kantian one. Kant comprehends the style of life that a republic requires as living in accord with the supreme (or universal) principle of right, even without requiring that this principle be explicitly endorsed by anyone as part of their structure of maxims. Given that right is comprehended in relation to universal laws (and subsequently with an authorization of coercion) the basic structure of this republic has a formal and not a material pattern. Lack of recourse to a justification of this kind of republicanism can only lead to the pattern of thinking about republican citizenship in such a way that it leads to a "clash of cultures". In order to promote stepping back from this in such a way that we can consider again the point of republics I suggest thinking anew about the relationship between the principle of right and publicity. Expect more in further postings.