Traditionally a predominantly Roman Catholic country, yet also with anticlerical leanings, France has since the 1970s been a very secular country. Freedom of religion is constitutionally a right, inspired by the Declaration of the Rights of Man and of the Citizen. The dominant concept of the relationships between the public sphere and religions is that of laïcité, which implies that the government and government institutions (such as schools) should not endorse any particular religion or intervene in religious dogma, and that religions should refrain from intervening in policy-making. Tensions occasionally erupt about alleged or real discrimination against minorities; see Islam in France.

The government does not maintain statistics as to the religion of its inhabitants. Statistics from an unspecified source and date given in the CIA World Factbook gives the following number: Roman Catholic 83 to 88%, Muslim 5 to 10%, Protestant 2%, Jewish 1%. However, in a 2003 poll 41% said that the existence of God was "excluded" or "unlikely". 33% declared that "atheist" described them rather or very well, and 51% said they were "Christian". When questioned about their religion, 62% answered Roman Catholic, 6% Muslim, 2% Protestant, 1% Jewish, 2% "other religions" (except for Orthodox or Buddhist, which were negligible), 26% "no religion" and 1% declined to answer. A Gallup poll established that 15% of the French population attend places of worship.

Bayonne Cathedral