Amazing.  You got at least 10 people, at least some of whom profess to be Catholic, to "like" the proposition that the Catholic Church's doctrine "is only good to study to figure out what went wrong."  Why are these people not walking contradictions?  Amazing, because we're not talking about abuses, such as the selling of indulgences, but doctrine --- the essentials of what the Church professes.  If these people so eagerly reject Church doctrine as a whole, then in what does their Catholicism consist?  They could just as well read the Bible, assert the priesthood of all believers, call Catholicism a bucket of BS, and call it a day.  More sense in THAT than in the absurdity of claiming to be Catholic while rejecting what Catholicism teaches.  Where's the credibility in THAT?  You can laugh now, DonInKansas.  No one expects a sensible rebuttal from you.