The latest Ifop poll found that up to 63 percent of French voters back gay marriage, against 60 percent in earlier January, while pro-adoption rate arrived at 49 percent.

A demonstrator shouts slogans during a march through the streets of Paris in support of the French government's draft law to legalise marriage and adoption for same-sex couples, January 27, 2013. [Photo/Agencies]

After the Socialist government approved the bill to allow same-sex couples to marry and adopt children in November 2012, religious leaders and conservatives mobilized against the move with France's leading Roman Catholic Church warning that the bill would destabilize the French society's equilibrium.

Until Friday night, more than 5,000 amendments to the bill had been tabled.