In a blog entry by Ron Dart titled A European Pilgrimage: Erasmus, Heidegger, Nietzsche, Hesse, the writer states
It does not take a great deal of reflection to watch the unravelling of Christianity with the coming to be of Protestantism.
What does the writer mean by the coming to be of Protestantism? Could you please explain to me what the phrase "coming-to-be" means in general, not only in this particular context? (I did not find any related entry in the dictionary.)