The Eastern Orthodox church is the result of an early schism from Catholicism. Technically it is protestant, but because it predates the reformation, we don’t usually refer to it as such. It is not in union with Rome.
Some of the regional churches that split at or near the time of this Eastern schism have in the centuries since then, come back into juridical, theological and practical union with Rome, and these constitute the other rites in the Catholic church. There are 21 of them in addition to the most populous rite which is the Roman Rite. The other rites tend to be small and regional but they are in union with Rome. The other rites were allowed to keep the traditions that they had at the time of entry that did not contradict union with Rome and Catholic theology and practice.
Churches that split from Rome during the Reformation, and that includes the Episcopalian/Anglican church, are considered protestants in the true sense of the word. None of them are in union with Rome and this includes the Episcopalian/Anglican church.
There is more to being Catholic than having some kind of foggy romanticism about being Catholic which is what you see with Anglicans and Episcopalians. There are juridical and practical issues, and the Episcopalian/Anglican church doesn’t have any of those in place. Theologically, we’re also somewhat different. You mentioned yourself about the theology of marriage. It’s different, and that’s just the start.
PS. Like the Baptists and Presbyterians have anything to say about all of this.

They’re not in union with Rome either.