In his published 95 theses martin luther protested against

In his published 95 theses Martin Luther protested against the abuses of the Catholic church.

Explanation:

The 95 Theses was a document with which Martin Luther denounced the abuses in the Catholic Church. It was published on October 31, 1517. It led to the Reformation and is therefore seen as the origin of Protestantism. The "95 Theses" denounced the indulgence trade, a concept of the Dominican priest Johann Tetzel that allowed the rich to buy the forgiveness of their sins from the pope. Luther thought it was unfair that the rich should not do penance when they confessed.