Profess All Doctrines Without Question
Acceptance of each and every doctrine of the Divine and Catholic Faith is essential to membership in the Catholic Church. And this is only reasonable. Let us take the Flat-Earth Society, if it still exists. Now to be a member of said society, one must accept that the earth is flat. To proclaim that it is round like a ball is heresy in the eyes of the Flat-Earth Society. Heresy is defined as any doubt or denial of a doctrine of the Divine and Catholic Faith. Now it is one thing for a person to ask an honest question in regard to a question of the Divine and Catholic Faith and quite another to willfully hold an opinion contrary to such doctrines. One can ask a question, because they are unsure on a matter, but willing to accept whatever Jesus teaches us through His Church once it is made known to them. This is not heresy. Heresy is a willful doubt or denial of a doctrine of the Divine and Catholic Faith. Such doctrines have been clearly defined by the Church through the Popes and Councils approved by the Popes throughout the last two millennia. They are normally taught to Catholics by means of the Catechism, which is compiled by the Church through her Pastors, the Diocesan Bishops. Heretics by their choice to believe contrary to the Catholic Church choose to leave the Catholic Church completely. Of necessity, this departure removes from them any and all authority they may have held in the Church. The Church must judge a person to be a heretic, if they give the outward appearance of heresy, because one must judge from what one sees. Unless heresy is notorious, that is committed in such a way as to be obvious to anyone who knows the Catholic Faith, the Church requires that her Pastors, the Diocesan Bishops make investigation and determination. Catholics are normally zealous to study their Faith and become quite familiar with the teachings of the Divine and Catholic Faith, as Pope Saint Pius X advised in his first Encyclical, Acerbo Nimis. True, laxity in this matter is not necessarily a sign of defection from the Divine and Catholic Faith, but in times of confusion a person leaves themselves open to deception by wolves in sheep’s clothing!Pope Pius XII in Mystici Corporis Christi, paragraph 22 stated: Actually only those are to be included as members of the Church who have been baptized and profess the true faith, and who have not been so unfortunate as to separate themselves from the unity of the Body, or been excluded by legitimate authority for grave faults committed. In the next paragraph he stated: For not every sin, however great it may be, is such as of its own nature to sever a man from the Body of the Church, as does schism or heresy or apostasy. 
