Martin Luther protested against church abuses.
Martin Luther was the one who protested against the catholic church (pope) for selling indulgences.
Martin Luther
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Lutheranism, set up by Martin Luther in 1555 when he protested against the Roman Catholic church.
he protested and went to church
He is a protestant because he protested the belief of the Catholic church about indulgences.
Martin Luther
The church sold indulgences as if God grants favors based on price paid. Martin Luther protested this, and the Church tried to force him to recant those views. He refused.
Martin Luther King vehemently protested and formed a new branch of the Christian religion called Protestantism. He publicly denounced the Church (which became the Roman Catholic Church) by nailing his 'theses' - a list of complaints against the Church, especially with regard to corruption within the church, to the church door at Wittenberg, Germany.
1517 was the year that Martin Luther nailed his 95 Theses to the Castle Church door in Wittenberg. You may read them at the link below.
Martin Luther was considered a heretic by the Catholic Church.