History is not my teacher, and neither is the church - the Almighty is! History is God's teaching assistant. The church (church in the wider sense, not just RC), what I can say is that the role it has played in recent history is debatable.
Everyone should be learning from history; the Bible doesn't cover everything you know. As for the church (lowercase refers to the broader community of Christians and uppercase refers specifically to the RCC), it will always have a substantial impact on history if for no other reason than that it shaped the thinking of the people who attended it.
You made an interesting assertion; something to the effect of the church that God established.
I know for a fact what God established was NOT an institution but a way back to his heart and away from the incident in Eden and all that the actions undertaken by Adam and Eve embodied. I hope what I have just said is clear!
It makes infinitely more sense for God to establish an institution to preserve the faith, teach the faith, and protect it from heretics; than it does for Him to have given us a vague "way" where diverse doctrinal discord is acceptable.
The message preached from Adam to today HAS NOT CHANGED. I take umbrage with people/institutions/thought processes that imply God has changed his message. His messengers have changed out of necessity because of death. But, the message has been the same!
I don't believe I said the message has changed.
Nothing new under the sun - very relevant because you always have a group of people distinguishing themselves as the unique carriers of God's message over and above everyone else! That message is usually creatively different to the one the 1st and 2nd Adam taught!
Assuming that the first part is referring to the RCC, We have kept the faith handed down to us since the beginning, and since we can trace back our roots to the Apostles, we have a legitimate claim as preservers of the truth. What really irks me though is conversations like I heard the other day while I was sitting at Starbucks and working on a paper. Two men were sitting in front of me and talking and both had Bibles out, one said to the other "God showed me something while I was reading the Bible, and I believe he gave me understanding to restore the ancient Christian faith". He then proceeded to espouse Arianism, and honestly it made me want to stand up and yell "You haven't discovered anything new your just retelling an old heresy".
Thats what amazes me about modern Protestantism, somehow it's managed to give birth to all the old heresies all over again; like Modalism (UPC), Judaizers (Messianic Judaism), Nestorianism (virtually every Evangelical/non-Mainline Protestant denomination), Arianism (Arian catholic church nad the Polish Brethren), Unitarianism (JWs and untold numbers of others), and things as far afield as Mormonism
To clarify the Arianism example; The Arian catholic church was never in anyway tied to the Roman Catholic Church. It was started by a Protestant minister who sought to restore the ancient church and basically took the Sacramental theology of the church fathers and mixed it with Arianism.