A woman prays next to a placard reading 'Family is sacred ! ' during a protest organized by fundamentalist Christians group Civitas Institute against same-sex marriage on January 13, 2013 in Paris. Tens of thousands march in Paris on January 13 to denounce government plans to legalise same-sex marriage and adoption which have angered many Catholics and Muslims, France's two main faiths, as well as the right-wing opposition. The French parliament is to debate the bill -- one of the key electoral pledges of Socialist President -- at the end of this month.