Islam is the second-most widely professed religion in France behind Catholic Christianity by number of worshippers. With an estimated total of 5 to 7 percent of the national population, France has the largest number of Muslims in Western Europe. The majority of Muslims in France belong to the Sunni denomination. The vast majority of French Muslims are of immigrant origin, while an estimated 100,000 are converts to Islam of indigenous ethnic French background. The French overseas region of Mayotte has a majority Muslim population.