structure covering England and Wales or Great Britain. Similarly, due to the relatively recent creation of Northern Ireland in 1921, most major religious groups in Northern Ireland are organised on an all-Ireland basis. Protestantism Anglicanism The Church of England is the established church in England. Its most senior bishops sit in the national parliament and the Monarch is its supreme governor. It is also the "mother church" of the worldwide Anglican Communion. The Church of England separated from the Catholic Church in 1534 and became the established church by Parliament in the Act of Supremacy, beginning a series of events known as the English Reformation. Historically it has been the predominant Christian denomination in England and Wales, in terms of both influence and number of adherents. The Scottish Episcopal Church, which is part of the Anglican Communion (but not a "daughter church" of the Church of England), dates from the final establishment of Presbyterianism in Scotland in 1690, when it split from the Church of Scotland. In the 1920s, the Church in Wales became disestablished and independent from the Church of England, but remains in the Anglican Communion. During the years 2012 to 2014 the number of members of the Church of England dropped by around 1.7 million. In 2018, 12% of the population of Great Britain identify as Anglicans, a sharp decline from 1983 when 40% of the population identified as Anglicans. Baptists The Baptist Union of Great Britain, despite its name, covers just England and Wales. There is a separate Baptist Union of Scotland and the Association of Baptist Churches in Ireland is an all-Ireland organisation. Other Baptist associations also exist in England, such as the Grace Baptist association and the Gospel Standard Baptists. Charismatics and Pentecostalism Assemblies of God in Great Britain are part of the World Assemblies of God Fellowship with over 600 churches in Great Britain. Assemblies of God Ireland cover the whole of the island of Ireland, including Northern Ireland. The Apostolic Church commenced in the early part of the 20th century in South Wales and now has over 110 churches across the United Kingdom. Elim Pentecostal Church had over 500 churches across the United Kingdom. There is also a growing number of independent, charismatic churches that encourage Pentecostal practices as part of their worship. These are broadly grouped together as the British New Church Movement and could number up to 400,000 members. The