I will let you in on a secret: this is the source of all the confusion: the word "church" is used in reference to ECUSA, when its not really apt. There are different senses of the word "church." There is the thing on the corner, made of brick. There is the "Baptist Church." There is the "Church of England." There is the "Anglican Church." And there is the "One, holy, catholic, and apostolic Church." Etc. Guess which one of these the Lord was talking about when he held up "unity" as a virtue. Here's a hint. It starts with an "O" and ends in an "ne, holy, catholic, and apostolic Church."
Read it all.