Scotland a territorial parish structure, with every community in Scotland having a local congregation. Scotland also has a significant Roman Catholic population, 19% professing that faith, particularly in Greater Glasgow and the north-west. After the Reformation, Roman Catholicism in Scotland continued in the Highlands and some western islands like Uist and Barra, and it was strengthened during the 19th century by immigration from Ireland. Other Christian denominations in Scotland include the Free Church of Scotland, and various other Presbyterian offshoots. Scotland's third largest church is the Scottish Episcopal Church. Islam is the largest non-Christian religion (estimated at around 75,000, which is
Religion in Scotland the 2011 census. The other major Christian church is the Roman Catholic Church, the form of Christianity in Scotland prior to the Reformation, which accounted for 15.9% of the population and is especially important in West Central Scotland and parts of the Highlands. Scotland's third largest church is the Scottish Episcopal Church. There are also multiple smaller Presbyterian churches, all of which either broke away from the Church of Scotland or themselves separated from churches which previously did so. In recent years other religions have established a presence in Scotland, mainly through immigration and higher birth rates among ethnic minorities.