Many find that being discreet with one's religion is a necessary part of being French, which has led to frequent divisions with some non-Christian immigrants, especially with part of France's large Muslim population. As such, the debate has taken place over whether any religious apparel or displays by individuals (e.g., the Islamic hijab, Sikh turban, Christian crosses, and Jewish Stars of David and kippah) should be banned from public schools. Such a ban in France came into effect in 2004. In the spring of 2011, the official non-discrimination agency, la HALDE, reinforced "laïcité" in hospitals—as advocated by the Minister of the Interior, Claude Guéant—and in public service generally. The simultaneous broadcasting of the traditional Protestant and Catholic Lent sermons (operating since 1946) has been interrupted. Earlier the broadcasting of the Russian Orthodox Christmas night liturgy was similarly stopped on 6/7 January.