Doctrines and moral truth is not changeable. What can change are the words that we use to explain them. In addition, disciplines that are instituted by the Church can be changed by the Church. The Church has the power to bind and unbind.
The problem that you will find is that many Catholics are poorly educated in the faith, often through no fault of their own. They read a doctrine written by a council in the 1500s and read it again in today’s language and believe that there has been a change, because the words are different. The case is that the target audience has changed. The Church adapts her language to the target population. For example, during the Protestant Reformation the Catholic Church came down very hard on heresy, apostasy and she even persecuted heretics or authorized their persecution.
Today, some people are in awe because the Pope is on friendly terms with Protestants, Jews, Muslims, Orthodox and others. The fact is that those statements were targeting Catholics who were breaking away from the Church. Those statements still apply today to any Catholic who is breaking away.
At the time, there was no such a thing as Lutheran church, or Baptist church, etc. They were Catholics who were following Luther, Calvin et al. Luther and Calvin were considered to be Catholics. The Church referred to them as protestants. Today, we would call them dissenters or protesters. What the Church said about heretics applied to them. it does not apply to people who are born 500 years later into a Protestant family. The Church was not thinking about them. She did not think that the heresy of Luther and Calvin would lead to a 500-year separation. No one thought that it would turn out that way. Everyone thought that if they hung in there, things would resolve themselves and life would go on as usual. The Church thought that if it punished by excommunicating, she would bring back her wayward children. Obviously, that did not happen.
The moral truth remains the same. Heresy is an evil to be avoided. What is different is that today we’re talking to the descendants of the heretics. Therefore, we must change our language and understand their situation. They are not the same people and the situation is not the same. They are not rebel Catholics. They are what they are.
To many people who do not stop to think about the history of these statements and who refuse to even consider how badly the Church handled the situation, today’s effort to be more fraternal and more honest sound as if the Church is changing the moral rules, which is not the case. The case is that she’s speaking to a different population.
In closing, I can offer one example from secular history. To the English of the 18th century, there were no such people as Americans. What they saw were terrorists, traitors, and anarchists. They responded accordingly. Today, we do not look at the English as our oppressors nor do they look at us as terrorists. Therefore, we speak to each other differently than we did in the 18th century. That does not mean that the rules that govern regarding terrorism, rebelling, treason and other have changed. Those rules are still there. But the people of England and the USA are not the same people. There is no need to treat each other that way. We do other things that strengthen our unity as two nations that respect each other.
The same happens with the Church and other faiths. She still condemns any Catholic who goes down the wrong path. But she also extends her hand in fraternity to those children of former Catholics and those who were never Christian.
Fraternally,
Br. JR, OSF