You may be a member of many organizations. They all have rules, created by people, usually for good reasons. You may disagree with some rules. You may lobby to change them. In many cases you could even morally ignore them. The Church is uniquely different. It was instituted by Christ to guide us to the salvation He earned for us on Calvary. He personally and directly gave the Church its authority. He promised its protection. To be disobedient to the Church is to be disobedient to God.

As a general rule, Protestants are not protesting anything. Many, like me, were born and raised in a Protestant denomination. Like Catholics, they recall seemingly endless fond memories of religious milestones (baptisms, confirmations, marriages), religious education (Sunday school, vacation Bible school, confirmation classes), service (teachers, church council, ushers) and countless religious holidays reverently celebrated with family and friends. Their faith is an important part of their identity and they can not picture becoming Catholic any more than they could picture a gender change operation!