Grace Seeker,
I agree that if a Catholic parish was teaching stuff that was contradictory to Sacred Scripture and Sacred Tradition, that I would take action.
I would contact the Bishop and let him know what was happening. In our diocese, this would get results. I’ve seen it happen in my own parish with just a small infraction (a variation in the liturgy that one of the priests was doing). Our Bishop is extremely conservative and doesn’t mess around.
If the Bishop of my diocese was not responsive, I would appeal to the Vatican itself.
IF the Church authorities pronounced that I was wrong, and that the church WAS teaching proper Scripture and Tradition, then I would repent, confess, receive absolution for my affrontery, and work to bring myself into compliance with the teachings of my Church.
So you see, there are other options open to Catholics than just leaving a parish.
I have heard of Catholics who begin worshipping at a different parish while the Bishop is working to straighten things out at the erring parish. I would certainly go along with this if there were children or teenagers who could be damaged by the false teaching. Also, I think that if I continued to attend an erring Catholic Church, I would try to attend at least a few masses each week at a sound Catholic Church, and also work to stay involved with sound Catholic Bible studies.
I’ve seen quite a few Protestants leave their churches because of “unScriptural teachings.” I myself have done so. In recent years, many Protestants that I know have left churches when they hired women pastors. My family left a Protestant church for that reason.
However, I’ve also seen many Protestants leave churches because of marriage, divorce, and remarriage issues. Specifically, I’ve seen Protestants leave their church because they were not allowed to teach or be elected to a leadership position because they were either divorced or divorced/remarried.
I have several books about MDR, and it’s amazing how every one of them has a different interpretation of the Bible about these issues. One book by IV Press presents four Biblical viewpoints, totally different, about marriage, divorce, and remarriage. One of the viewpoints is that divorce is NEVER permitted, ever ever. Another viewpoint is that since God Himself was divorced, He allows divorce and remarriage. Another viewpoint is that divorce and remarriage are God’s way of healing people. etc.
So with fear and trembling, I will say that many Protestants leave a church because they can’t get their way, and they use the Bible to prove that “their way” is the “true way” and that their church is in error.
Thank God that I can trust the Authority of the Catholic Church and that I don’t need to come up with my own personal interpretation of the Bible!