The old "Thirty-Nine Articles" was fairly hard-line Protestant in its ultimate form, having been subject to the tender mercies of Edward VI's advisers (they are also the loons who changed the words of consecration for bishops and thus started the whole Apostolic Succession controversy. Coulda done without that.) But those have now been relegated to the status of "Historical Documents" rather than articles of faith.
"Consubstantiation" is a Lutheran, not an Episcopalian doctrine. We don't have High Holy Days of Obligation, just Holy Days of Obligation - and while it's not required in the sense that it is a sin to skip, the faithful are urged to attend.
Part of the confusion is due to Queen Elizabeth I's intention of making the English Church a "big umbrella". There are parishes that are "Higher Than Rome", and there are parishes that are so low they are indistinguishable from Mainline Baptist. I've attended both.