Goodness, you would have quite a list when all is said & done. For example, many churches hold gay marriage weddings & fly LGBTQIA+ flags.
Or are you looking for oddballs that aren't a dime a dozen?
Whereas I object to these practices in the mainline denominations, this thread is not specifically about denomination-level issues but rather is about individual local churches, cathedrals, chapels, parishes, even monastic communities, within any denomination or that are entirely independent, that are in some doctrinal or liturgical respect highly divergent both with the normative beliefs of their denomination or general category, and with the Nicene Christian faith as a whole, or which are engaging in practices that could be abusive of their lay members, or both. So yes, oddballs that aren’t a “dime a dozen” but rather which are engaging in something that most members of even their own denomination might very well find highly objectionable.
So if I were writing this list back in 2012, and I were at the time aware of the problem, which was not, I would include, as an example, the local Coptic Orthodox church in Muqattam, Egypt, which was wandering a bit far from the Coptic tradition to put it mildly, but since that time a new bishop, H.G. Abanoub, was sent to that church, who is extremely stalwart in Coptic Orthodoxy, and the problems at that church, which serves the extremely impoverished Christians of the town of Muqattam in suburban Cairo who are forced to live off of pork from swine herds which feed in the adjacent landfills, have been rectified. So my goal is twofold: that people are aware of these divergent churches, which being local churches not in accord with the normal beliefs of their denominations, are obscured, and the extent to which they are not what they appear is not necessarily evident to someone who might otherwise worship in them, and also secondarily, since the majority of these churches like, for example, Capitol Hill Baptist Church or the Cathedral of St. John the Divine are members of denominations which in theory could reign them in or remove them, and in this manner I could remove them from this list.
Reigning in these wayward local churches, I should add, would be particularly easy, I would note, for the ELCA and the Episcopal Church and the UMC in the case of the parishes of those located in Alameda, and in San Francisco, and Seattle, which made it to this list, since these churches have bishops, and the divergent parishes are just local parishes and not cathedrals or independent churches, for example, Westminster Abbey and Savoy Chapel in London are under the personal authority of Queen Elizabeth in her role as the Supreme Governor of the Church of England and Defender of the Faith, and are not under the authority of any diocesan bishop nor directly subordinate to the metropolitical authority of the Archbishop of Canterbury, and thus are in theory more difficult for the Church of England to regulate.
And indeed the Savoy Chapel has historically been something of a minor oddity within the C of E for different reasons, in that for many years it was the only Anglican church in London which would remarry divorced persons, but these minor oddities are not sufficient to earn it a place on this list, in my opinion, based on what I know about it.
There is presently only one church pending addition to this list, which is a mainline protestant North American parish which did something I regard as truly shocking, but what they did has shocked and horrified me to the point where I am not sure they could be put in the same group of these churches, which are problematic churches which in each case can in theory be rectified, even in the most extreme case which is of course Westboro Baptist Church, which has managed to embarrass all other American Christians of a traditional view on human sexuality, which of course includes myself, but their action stop extremely short of what this particular church did.
Specifically, without getting into the dreadful details, the church which I am considering adding to this list did engage in what you and I would regard as an act of violence
in extremis in the course of worship which is something so far beyond the pale as to seemingly put that parish, and possibly the mainline denomination of which it is a member, in a different category altogether. Indeed I have privately discussed the matter with other members and still have not resolved what to do about it pastorally or personally.