The Church has not changed its position on doctrine and morals. Never will. They don't change.
The Protestant churches have obviously changed 40,000 times on their interpretation of the Bible. Else, why would there be so many different ones? There is STILL only ONE Catholic Church (Yes, the Orthodox Churches are Catholic too.), after 2000 years, with the same doctrine and moral teachings of 2000 year ago.
Ask your questions on Catholic.com. They can answer your questions chapter and verse. I'm not a doctor of the Church and don't have all the answers, chapter and verse. They do there.
If you just want to nitpick at me, then, GO AWAY.
I am talking about the adding of so many traditions, that are not found in the Bible. The banning of reading the Bible by the lay, requiring the Mass in Latin, Purgatory, Papal infalibility. These have all been added to the Church through the ages.