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
Scotland in the modern era of the population. The Roman Catholic Church accounted for 15.9% of the population and is especially important in West Central Scotland and the Highlands. In recent years other religions have established a presence in Scotland, mainly through immigration and higher birth rates among ethnic minorities, with a small number of converts. Those with the most adherents in the 2011 census are Islam (1.4%, mainly among immigrants from South Asia), Hinduism (0.3%), Buddhism (0.2%) and Sikhism (0.2%). Other minority faiths include the Bahá'í Faith and small Neopagan groups. There are also various organisations which actively promote humanism and secularism, included within