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 Middle Ages had been established by the end of the fifteenth century. While some historians have discerned a decline of monasticism in the Late Middle Ages, the mendicant orders of friars grew, particularly in the expanding burghs, to meet the spiritual needs of the population. New saints and cults of devotion also proliferated. Despite problems over the number and quality of clergy after the Black Death in the fourteenth century, and some evidence of heresy in this period, the church in Scotland remained relatively stable before the Reformation in the sixteenth century. Modern Scotland is half the size England and Wales in