I was raised in the Anglican Church but it has changed significantly in my lifetime such that I no longer recognise it as the same Church. It also never sat well with me that someone could be a complete heretic and still remain in good standing in the Church (Bishop John Shelby Spong)
And before Bishop Spong there was Bishop James Pike, who was the Bishop of San Francisco in the 1960s and was subject to a heresy trial after he made remarks that deprecated the Holy Trinity and other essential articles of faith, but astonishingly and disastrously, the bishops of the Episcopal Church failed to convict him.
However, there are Anglican provinces which are committed to doctrinal orthodoxy as well as local Anglican churches including some in the Episcopal Church, as there is still one traditional Anglo-Catholic seminary remaining that ordains Episcopalian clergy as well as clergy for related denominations, that being Nashotah House.
It was by the way the seminaries, according to my retired friend, Fr. Steve Dean, that caused the leftward shift of the Episcopal Church, since most of the seminaries fell under the control of various modernist theological movements such as the Liberal Catholic movement, and the formation in these seminaries stressed a different set of values than those previously embraced by the Episcopal Church. The LCMS was able to avoid going down a similiar direction in the 1970s by taking control of its main Concordia seminary (which resulted in a bit of drama known as Seminex, which my friend
@MarkRohfrietsch is familiar with, but the net effect was very positive in that the LCMS, which had been a mainline denomination, was able to pull back from the edge and retain the traditional beliefs of Lutheran orthodoxy. Likewise the SBC was also at one time regarded as a mainline denomination, but it also underwent a course correction.
The nice thing about the Orthodox Church however is that change is simply not accepted by the faithful. Even relatively minor changes to the liturgy, when forced upon the the laity, have caused schisms, for example, the Revised Julian Calendar led to the Old Calendarist Movement, and the persecution by Czar Peter of those who refused to accept the efforts of Patriarch Nikon to standardize the liturgy and make the Russian service books consistent with those in use in the Greek church led to the Old Believer schism, but fortunately large scale reconciliation with the Russian Old Rite Orthodox has occurred since the early 1800s starting with the formation of “Edinovertsy” parishes which used the Old Rite but were in communion with the rest of the Russian Orthodox Church. It is also worth noting that Peter the Great refused to allow the Holy Synod to appoint a successor to Patriarch Nikon, and also reduced their number to just the three most senior metropolitans of the Russian church, and appointed an Imperial bureaucrat, the Imperial Procurator, to the synod (ostensibly to represent the Emperor, but he exercised the real power, particularly since he was the official in charge of the church budget, and the Holy Synod by all accounts did not do a very good job running the Russian Orthodox Church, with most of the major accomplishments of that era being the result of popular movements such as enthusiasm for the Jesus Prayer sparked by the anonymous book The Pilgrim’s Journey, and through the work of individual saints such as St. Seraphim of Sarov, St. Ignatius Brianchaninov, and St. John of Kronstadt, and in the US by St. Tikhon of Moscow, before he became Patriarch in 1917.