Dogma - teachings left to us by the Apostles. Dogmas includes both Scripture and Sacred Tradition. It is infallible, and it cannot be altered, changed, added to, or subtracted from.
Doctrine - This is a formally defined teaching which has been promulgated by an ecumenical council (like Nicaea or Trent) or declared an infallible teaching by a reigning Pontiff. Doctrine is also infallible, and also cannot be changed---but it likewise cannot contradict Scripture, Tradition, any previous infallible statement, or another doctrine. Examples include the Immaculate Conception and the Holy Trinity.
Discipline - This is an explanation of some aspect of the Faith. It is not infallible, and can be changed, evolved, condemned, or abandoned. Examples of this are limbo and Mary as Co-Redemptrix.
Practice - This is a rule established by the Church to help the believer walk the straight and narrow path; examples include clerical celibacy, not eating meat on Fridays during Lent, and fasting on Ash Wednesday and Good Friday.
Devotion - The lowest level of Catholic belief; devotions are usually more or less up to the individual believer to practice or not. This category includes such things as the Rosary, First Friday devotions, first Saturday devotions, etc.
The Catholic Faith is composed of 22 Churches spread across Six Rites as follows:
Alexandrean Rite
Coptic Catholic Church
Ethiopian (& Eritrean) Catholic Church
Antiochene Rite
Syriac Catholic Church
Syro-Malabarese Catholic Church
Syro-Malankarese Catholic Church
Armenian Rite
Armenian Catholic Church
Byzantine Rite
Albanian Catholic Church
Belarusan Catholic Church
Bulgarian Catholic Church
Croatian Catholic Church
Georgian Catholic Church
Greek Catholic Church
Hungarian Catholic Church
Italo-Greco-Albanian Catholic Church
Melkite Catholic Church
Russian Catholic Church
Romanian Catholic Church
Ruthenian Catholic Church
Slovakian Catholic Church
Ukrainian Catholic Church
Latin Rite
Roman Catholic Church
Maronite Rite
Maronite Catholic Church
Thus, Practices and MAYBE even Disciplines MAY vary from Rite to Rite and Church to Church but Doctrines & Dogmas, however, are universally accepted across the entire Catholic Faith.
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