France is a secular country where freedom of thought and of religion is preserved, by virtue of the 1789 Declaration of the Rights of Man and of the Citizen. The Republic is based on the principle of "laïcité", that is of freedom of religion (including of agnosticism and atheism) enforced by the Jules Ferry laws and the 1905 law on the separation of the State and the Church, enacted at the beginning of the Third Republic (1871–1940). A 2011 European poll found that a third (33%) of the French population "does not believe there is any sort of spirit, God or life force. In 2011, in a poll published by Institut français d'opinion publique 65% of the French population describes itself as Christians, and 25% as not adhering any religion.