What was the Protestant Reformation?
The short answer
The Reformation was a 16th-century movement, begun by Martin Luther in 1517, that challenged Church abuses and key Catholic teachings, leading to the formation of Protestant churches. The Catholic Church responded with genuine reform at the Council of Trent. Today Catholics and Protestants work toward reconciliation while real differences remain.
Real problems
By the early 1500s, there were serious abuses in the Church: worldly and corrupt clergy, poor preaching, and the scandalous selling of indulgences. Many Catholics, including saints, called for reform.
Luther and the break
In 1517 Martin Luther, an Augustinian friar, posted his 95 Theses criticizing the sale of indulgences. The dispute quickly widened into disagreements about doctrine:
- Scripture alone (sola scriptura) versus Scripture and Tradition.
- Faith alone (sola fide) in justification.
- the authority of the Pope and councils;
- the number of sacraments and the nature of the Mass.
Other reformers — Zwingli, Calvin, and the English Reformation under Henry VIII — produced further divisions.
The Catholic response
The Council of Trent (1545–1563) clarified Catholic teaching on Scripture, justification and the sacraments, and enacted real reforms: seminaries for priests, an end to selling indulgences, and renewed catechesis. Saints such as Ignatius of Loyola, Teresa of Ávila, Charles Borromeo and Francis de Sales renewed the Church from within.
Wounds on both sides
The Catechism acknowledges that divisions arose "often enough, men of both sides were to blame" (CCC 817), and that those born into Protestant communities today cannot be charged with the sin of separation (CCC 818).
Toward unity
In 1999, Catholics and Lutherans signed a Joint Declaration on the Doctrine of Justification. Christ prayed "that they may all be one" (John 17:21) — and the Church shares that prayer.