The Roman Catholic Church in France is calling on members to show their opposition to a planned marriage reform.

The Socialist government of President Francois Hollande is expected on Wednesday to introduce a bill which would legalize gay marriage.

At the church's annual plenary held in the town of Lourdes on Saturday, Paris Cardinal Andre Vingt-Trois called on Catholics to oppose the measure, Reuters reported.

“The presidential and legislative elections did not give them carte blanche, especially not for reforms that very profoundly affect the equilibrium of our society,” said Vingt-Trois.

“It will not be 'marriage for all,' it will be the marriage of a few imposed on all,” he added, calling the proposed reform “a fraud.”

Government officials have said they expect to pass the reform by mid-2013.

In August, gay rights advocates chided Vingt-Trois for criticizing the plan in its “Prayer for France,” which was read in Catholic churches across the country to mark the feast of the Assumption. Churchgoers were asked to pray for “newly elected officials” to put their “sense of common good over pressure to meet special demands” and that “children cease to be objects of the desires and conflicts of adults and fully benefit from the love of a father and a mother.”

Plans to make France the 12th country to legalize gay nuptials were set in motion in June when Socialists won control of both houses of Parliament, just weeks after Hollande, who campaigned on the issue, was elected to lead the nation.