By announcing the forthcoming adoption of a law authorising gay  marriage, the French government has provoked a series of mobilisations and media debates where everyone is asked to choose their camp : ‘for’ or ‘against’ gay marriage.  The same thing has happened in other countries: in Britain David Cameron’s proposal to legalise gay marriage has created deep divisions in both the Tory party and the Anglican Church (which had already been convulsed by the scandalously radical idea of allowing gay priests and women bishops).