"France is a rather progressive country ... but you shouldn't forget that France also has some parts of rather conservative society and in times of economic crisis, people tend to cling to what they know and fear change, forgetting sometimes that change can bring improvements."
Nonetheless, he is confident that the measure will pass sooner rather than later.
"France is a secular society, so it's very different from other countries where religion plays a large part in the question of marriage," he said.
"There is a clear majority in parliament in favor of this bill, so it will become law."
Engineer Driss Houat, 69, told CNN Thursday he opposes the measure. "I am completely against it because God created man and woman so that they could be married. Not for anything else. It's absurd for me to see this bill pass," he said.
But Myriam Duru, 37, a manager at a Tommy Hilfiger store, disagrees.
"I am Muslim, so I believe in God. I think it's not a problem for me to accept. I don't understand people who think that God exists and can say 'I'm against the happiness of people,'" she said.
Alexis Nys, a 58-year-old salesman, said he supports same-sex marriage "because at the end it's love that matters. Not old things and old fashions. I think we need to live like we should live today."
A law legalizing civil unions was introduced in 1999 in France under a previous Socialist government.
Known in France as the PACS (pacte civil de solidarite), the civil union agreement can be entered into by same-sex or straight couples and confers many but not all of the rights of marriage.