Switching gears slightly, I don't quite see your dilemma/struggle. The Church has long had doctrinal standards and they are by and large enshrined in the BCP just as you've been pointing out to us. BUT there are now many Episcopalians who no longer want to be bound by them...and no one is forcing them to.
So as for yourself, there's no issue here about what Anglicanism stands for. There's only an issue of which group of Anglicans you want to stand with, if either.
That is precisely my dilemma -- which group of Anglicans to stand with. For the past nine years I've worshipped at both TEC and AMIA. When I moved to Washington state I ended up at TEC mainly because the ACNA/PEARUSA is far away and I had an unreliable car. Now I have a new car and going to the ACNA church is a possibility.
In a way, as an observer, I like going to a variety churches. It's interesting to hear varying perspectives. I think I should get more involved, though.
When I go to TEC, I sometimes get uneasy that nearly half the priests around here are openly gay and nearly half are women. I worry that it might be cavalier to disregard or dismiss several sections of the Bible. One Episcopal priest told me that people just need to know God and if they're happy knowing God through Islam, he's fine with that -- is that even a Christian perspective? Yet, that seems common in TEC. I rarely get anything useful from the sermon either. OTOH, I love the spirit of inclusiveness. Who am I to judge? I'm not convinced of the inerrancy of scripture myself. I appreciate that there's a real respect for both women and homosexuals. I appreciate the open-mindedness of not over-simplifying the complexity of scripture.
The AMIA churches that I went to in Colorado were great. The preaching was really thought-provoking and useful in my daily life. They had great cell groups with people who really wanted to study, learn, pray, and improve themselves. OTOH, I also found bigotry in those churches. Many of those people are just using Bible passages to justify their prejudices.
So in the one denomination I'm concerned about large passages of the Bible possibly being dismissed and in the other I'm concerned about large segments of the population possibly being dismissed.
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Putting that larger issue aside for a moment, the much less important issue that prompted the OP was the main index of this forum. There are a few sections that say, "orthodox Christian Only." Since I had been told by an Episcopal priest that Episcopalians aren't considered orthodox, I wondered if that's who they were trying to exclude. After all, it doesn't say, "Christians Only." I tried asking a moderator a couple weeks ago, it got muddled, she wanted to take it up in a series of private messages, and I don't think she ever understood what I was asking. I'm still unsure who is intended to participate in the "orthodox Christian Only" sections, though I am decidedly Christian. I have no doubt on that point.