Why was Martin Luther unhappy with the Catholic church?

Luther had many complaints against the Roman Catholic Church.

He made a list of his grievances called the 95 theses and pinned them to the church door. These were intended only for scholars as it was written in Latin (the language of the scholars) but soon it was translated into German and was circulated among the people.

One of Luther's biggest problems with the church was the selling of indulgences. People believed they could buy their way out of sin without any faith aspect at all. Johann Tetzel said, "As soon as the coin in the coffer rings, a soul from Purgatory springs." Luther believed that indulgences were not right and biblical and would not bring people to heaven. He accused the church of leaving people in their sin instead of showing them the way to heaven.

Luther believed that you could not get to heaven by doing good works but by faith and faith alone.

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that the church sold indulgences