Roman Catholics are 93 percent of the people of Ireland, and 4 percent of the people are Protestants. Protestant groups include the Church of Ireland (Anglican) and the Presbyterian and Methodist denominations. Freedom of worship is guaranteed by the constitution. Almost all the people speak English, and about one-fourth also speak Irish, a Gaelic language that is the traditional tongue of Ireland. Irish is spoken as the vernacular by a relatively small number of people, however, mostly in areas of the west. The constitution provides for both Irish and English as official languages.