It is an interesting study. Not sure how p(name removed by moderator)ointing or not means anything, especially if you think that means “it"never happened (error.compromise etc). it is like asking a drug addict when they began their “descent”. P(name removed by moderator)ointing that is problematic, but it doesn’t mean they have no problem. Or a couple wants a divorce after 30 years of marriage. You ask to p(name removed by moderator)oint how that came to be. No exact point does not mean they don’t have a problem…The other problem is that some think the church infallible in certain areas and see the church as a particular institution (theirs) instead of the “called out ones”, the “ecclesia”, a universal institution. So then the problem arises to determine who and what does God promise to be with and guide , and how do you judge His guidance,by being perfect , infallible ?..But your study is good. I would think if it is possible for you to take one dogma/practice/rite/writing at a time, and not look at one mistake as pandoras box where everything crumbles. Like don’t throw out the baby with the bathwater. One can also work backwards . For instance, I would say the last two ex-cathedra statements were” not needed", even errant. Anyways, it is not “one” thing that did it, hence no magical, revealing “one” date.