Here's why:
* Her father, King Henry VIII, broke away from the Catholic Church to establish the Church of England, making himself the head of the church.
* Elizabeth was raised in the Protestant faith, although her mother, Anne Boleyn, was executed by Henry VIII.
* Elizabeth I embraced the Protestant faith and supported the Church of England, which she saw as essential for maintaining stability and unity in her kingdom.
While she was raised Protestant, she did encounter some challenges to her rule from Catholics, particularly during the reign of her Catholic cousin, Mary I, who had her imprisoned during her early years.
Elizabeth's reign is seen as a time of great religious and political change in England, as she sought to establish a compromise between Catholicism and Protestantism that would satisfy the majority of her subjects.