I don't really know much about Catherine of Siena, as she's not quite in my period. But I don't think she has had a vast amount of influence on the church, because she wasn't a particularly original theologian or mystic or anything like that; she was just one of the many mystics around at that time. She must have been a very major figure at the time, but not one who really changed anything substantial. Don't forget that the most of the northern half of Europe doesn't speak romance languages! Also, you don't have to be a Catholic to speak a romance language; look at the Reformed tradition in France, for example. Questions like this are very hard to answer because of the notorious difficulty in assessing the numbers of Christians (or people of any faith) in various countries. I've seen arguments on this very site where one person insists that a given country is still largely Christian, while another insists that it is largely unchristian, and yet they are both from the same country. How do you define "Protestant" or "Catholic"? Is it about heritage, or active participation? I don't believe there are any Christian monastic orders that don't involve vows of chastity. The monastic lifestyle really isn't compatible with marriage. But perhaps there are some I haven't heard of. There are orders which allow marriage, but these are "lighter" versions of orders whose mainstream is more hardcore. For example, the Franciscan order is celibate, but it includes a group called the "Third Order" (or, more properly, the Secular Franciscan Order) which is for seculars (ie, people who have not devoted their lives to the religious lifestyle). Members of this order aim to live their lives in a way that follows Franciscan principles, but while living a secular lifestyle, including marriage.