The established religion of the realm is the Church of England, whose supreme governor is Queen Elizabeth II although in practice the is governed by its bishops under the authority of Parliament. Twenty-six of the church's 42 bishops are Lords Spiritual, representing the church in the House of Lords. The dioceses of England are divided between the two provinces of Canterbury and York, both of whose archbishops are considered primates. The church regards itself as the continuation of the Catholic church introduced by St Augustine's 6th-century mission to Kent, although this is disputed owing to procedural and doctrinal changes introduced by the 16th-century English Reformation, particularly the Thirty-Nine Articles of Religion and the Book of Common Prayer. In 2010, the Church of England counted 25 million baptised members out of the 41 million Christians in Great Britain's population of about 60 million; around the same time, it also claimed to baptise one in eight newborn children. Generally, anyone in England may marry or be buried at their local parish church, whether or not they have been baptised in the church. Actual attendance has declined steadily since 1890, with around one million, or 10% of the baptised population attending Sunday services on a regular basis (defined as once a month or more) and three million- roughly 15%- joining Christmas Eve and Christmas services. It has around active and ordained clergy.