Why did Charles the fifth oppose the Reformation?

Charles V opposed the Reformation primarily because it threatened the unity of his vast empire, which included diverse territories across Europe. He was a devout Catholic and saw the Protestant movement as a challenge to the authority of the Church and the political stability of his reign. Additionally, he believed that religious discord could lead to social unrest and undermine his power. His commitment to maintaining Catholic orthodoxy prompted him to take military and political measures against Protestant leaders and communities.