 Mainstream theologians believe it contained liturgical details and certain other pagan traditions which remain a part of some branches of mainstream Christianity (for example, the doctrine of transubstantiation is thought to have been a part of this by Catholic theologians).Important esoteric influences on the church were the Christian theologians Clement of Alexandria and Origen, the main figures of the Catechetical School of Alexandria.Protestants (most significantly starting with Martin Luther) and evangelical Christians have formally taught that the Bishop of Rome, along with the Catholic Church, greatly abused the original teachings and practices of the primitive or original Christian Church.