Until recent decades, the idea of a Catholic marrying outside the faith was practically unheard of, if not taboo.
Such weddings took place in private ceremonies in the parish rectory, not in a church sanctuary in front of hundreds of friends and family.
The Reformation (from Latin reformatio, literally "restoration, renewal"), also referred to as the Protestant Reformation, was a schism from the Roman Catholic Church initiated by Martin Luther and continued by John Calvin, Huldrych Zwingli, and other early Protestant Reformers in 16th century Europe.
It is usually considered to have started with the publication of the Ninety-Five Theses by Luther in 1517, lasting until the end of the Thirty Years' War with the Peace of Westphalia in 1648.
Even if a marriage is presumed valid, it is not also sacramental sacramental marriage until proven otherwise.
Since sacraments cannot be broken, non-Catholic Christians need to have their prior unions investigated and their marriage bonds declared null to be free to validly marry again within the Catholic Church.
So Validity is one dimension; sacramentality is another.
Lutheran churches were founded mostly in Germany, the Baltics and Scandinavia, while the Reformed ones were founded in Switzerland, Hungary, France, the Netherlands and Scotland.A marriage between a Catholic and another Christian is also considered a sacrament.In fact, the church regards all marriages between baptized Christians as sacramental, as long as there are no impediments.Theologican Robert Hater, author of the 2006 book, “When a Catholic Marries a Non-Catholic,” writes: “To regard mixed religion marriages negatively does them a disservice.
They are holy covenants and must be treated as such.” A marriage can be regarded at two levels – whether it is valid in the eyes of the church and whether it is a sacrament.The short answer is that any time one man and one woman of legal age exchange consent (I do), the marriage is assumed to be valid until proved otherwise (even if neither is baptized) since we believe that "natural marriage" is written deep in the hearts of all men and women.