Anglicanism is a nonsense religion, a dim, pathetic, ridiculous superstition, developed within the last 150 or so years. It relates to what is doctrinally distinctive about those in communion with the See of Canterbury. Sometimes it is expressed in terms of a via media: some sort of Middle Way between the excesses, on the one side, of Protestantism, on the other side, of Popery. Sometimes it appears in the form of an idea called the Branch Theory, in which Christ's Church is composed of three Branches: the Roman; the Greek; and the Anglican. No explanation is ever thought necessary as to why the 'Monophysite' Syrian Orthodox Christians who meet in S Thomas's are not a 'branch', or why the Methodists, or the Swedish Lutherans, or the Moravians, are excluded. Little consideration is ever given to the possibility that the Great Latin Church of the West might be deemed a Via media between those Western ecclesial bodies, including the Anglicans, who were exposed to the 'Reformation' with its radical denials of Tradition and of Sacramentality, and the Orthodox.
Sometimes this 'Anglicanism' is constructed by looking at the Prayer Book and the Articles. Sometimes, by examining carefully the writings of those divines, Caroline or Tractarian, who attempted to modify the damage done to the Provinces of Canterbury and York by the 'Reformation'. In each case, the unspoken assumption is that Anglicanism started with the breach from Rome. You have the bizarre situation in which Anglicans cheerfully claim to be the ancient Catholic Church of this land, yet if you asked any of them "Who founded the Church of England?", 95% would reply "Henry VIII". (I regarded it as a triumph of my 6-year ministry in Devon that, after I put that question onto a pub-quiz, my parishioners were a little uncertain whether the answer on Father's answer-sheet would be S Gregory or S Augustine.) The legal position in English law of the Church of England is that she was founded in 596; yet pretty well anybody would tell you that she started with the breach from Rome.
Funnily enough, there is a distinctive doctrine of the poast-Reformation Church of England, yes, just one; or rather, there was until comparatively recent times: the doctrine of Royal Supremacy. In a raw and murderous form under Henry VII, this meant that the Monarch could change the doctrine of the Church upon a moment's whimsy or confiscate the chalice in each parish church if he found himself strapped for cash. In the more gracious period of the Stuarts, when the C of E, instead of resenting the tyranny of the Tudors, rather welcomed the patronage and protection of a kindlier dynasty, this transformed itself into the dogma of Passive Resistance: that even a bad monarch ought to be resisted by nothing more violent than passive non-collaboration. This is what distinguished Anglicans from both Protestant and Popish dissent. Neither Catholics, nor Evangelicals, nor Liberals, make this the basis of their understanding of 'Anglicanism' nowadays.
The sooner that 'Anglicanism' is shovelled into the trash-can of History, the better.
I have one footnote to add to this tomorrow.