What term is used for a member of a Christian church founded on Reformation principles?

The term "Protestant" refers to members of Christian denominations that originated from the Reformation, a movement in the 16th century that sought to reform the Roman Catholic Church and led to the establishment of various independent churches. The Reformation was characterized by challenges to church doctrines, practices, and the authority of the pope, and it sought a return to biblical sources of faith. The movement resulted in the creation of several major branches of Christianity, including but not limited to Lutheranism, Calvinism, and Anglicanism, which are all considered Protestant denominations.

While "Lutheran" also refers to a specific denomination within the Protestant tradition, it is not the overarching term that encompasses all churches founded on Reformation principles. "Catholic" refers to the Roman Catholic Church, which remained unchanged by the Reformation, and "Orthodox" typically refers to Eastern Orthodox Christian churches, which split from the Catholic Church long before the Reformation. Hence, Protestant accurately captures the wider group of churches that emerged as a result of Reformation ideologies.