Understatement of the New mellenium!
Like all institutions in this world. The old saying goes that Hell is paved with the skulls of bishops. In part, that’s because bishops assume a certain responsibility when they take their posts.
On the other hand, I believe in papal infallibility. Twice in history a pope came very near to promulgating heresy, and twice drew back. There have been some wicked popes, without question, notably in the Renaissance, but they have not promulgated heresy.
The same with Church councils. Vatican II has had many undesirable effects, partly of course due to the efforts of dissidents to misinterpret it, but also partly because it does not strike me as one of the more effective or necessary Church councils. No heresy was promulgated, but that doesn’t prevent it from having become more of a source of trouble than of genuine reform and improvement.
Since the UMC is not governed in the same way as the Catholic Church, it may be harder to make these distinctions (ditto the Anglican Church). But there is still a difference between a sacred institution with its share of sinners and a corrupted institution that needs to close down.