This question examines the difference between the American Baptists and Southern Baptists in the USA. In the UK, there is one formal Baptist denomination, the Baptist Union of Great Britain (BUGB). ...
What role does the British monarch play as leader of the Church of England? Furthermore, how has this role changed over time?
Wikipedia lists these denominations as "mainline protestant" churches in the United States: American Baptists Disciples of Christ Congregationalists / United Church of Christ Episcopalians Lutherans ...