Answer: Because he felt that the church needed reform.
Step-by-step explanation:
And not only was Erasmus of Rotterdam a church figure who advocated church reform, Martin Luther and Jean Calvin were also Catholics with high theological education and sought to change the situation in the church. When we talk about Erasmus, he stood out from the others with his approach because he thought that the church should be slightly reformed from within. He believed that the procedure should be gradual. Like many other reformers, Erasmus saw how many clergymen used positions for their benefit, and he pointed it out. Because of his actions, the church declared him an enemy. Erasmus has been remembered throughout history as one of the greatest humanists ever.