Short answers, pulled from the story.
The Thirty-nine Articles of Religion are the historically defining statements of doctrine and practice for the Church of England, finalised in 1571. They address subjects including the Trinity, Scripture, sin and salvation, the sacraments, church authority, and civil society. They form part of the Book of Common Prayer.
The Thirty-nine Articles were finalised in 1571. They emerged from at least five earlier doctrinal statements, beginning with the Ten Articles of 1536 and including the Six Articles of 1539, the King's Book of 1543, and the Forty-two Articles issued by Royal Mandate on the 19th of June 1553. The Forty-two Articles, drafted under Archbishop Cranmer, were the most immediate predecessor.
The via media, Latin for middle path, describes how the Thirty-nine Articles navigate a position between Catholic doctrine and Reformed Protestant teaching. Theologian Henry Chadwick identified this navigating role as central to the Articles' character. Some Anglican scholars have labelled the resulting theology an early example of "Reformed Catholicism."
The Thirty-nine Articles recognise only two sacraments: baptism and the Lord's Supper. The five rites the Catholic Church calls sacraments are described as either corrupted imitations of the Apostles or as states of life allowed in the Scriptures. The doctrine of transubstantiation is condemned as repugnant to the plain words of Scripture.
John Wesley adapted the Thirty-nine Articles for use by American Methodists in the eighteenth century, producing the Articles of Religion that remain an official doctrinal statement of the United Methodist Church. In 1801, the US Episcopal Church adopted a revised version of the Thirty-nine Articles that deleted the Athanasian Creed. The US Episcopal Church has never required its members to formally subscribe to the Articles.
The Test Act of 1672 made adherence to the Thirty-nine Articles a legal requirement for holding civil office in England. That requirement remained in force until its repeal in 1828. At Oxford University, students were expected to sign the Articles until the Oxford University Act of 1854.