I stand by what I wrote…. Here is a paragraph from the 1917 Catholic Encyclopedia on the subject….

As we have several times emphasized, not every marriage is a true sacrament, but only marriages between Christians. One becomes and remains a Christian in the sense recognized here through valid baptism. Hence only one who has been validly baptized can contract a marriage which is a sacrament; but every one can contract it who has been validly baptized, whether he has remained true to the Christian faith, or become a heretic, or even an infidel. Such has always been the teaching and practice of the Church. Through baptism one “becomes a member of Christ and is incorporated in the body of the Church”, as declared in the Florentine Decree for the Armenians; so far as law is concerned, he remains irrevocably subject to the Church, and is therefore, in legal questions, always to be considered a Christian. Hence it is a general principle that all baptized persons are subject to universal ecclesiastical laws, especially marriage laws unless the Church makes an exception for individual cases or classes. Hence not only the marriage between Catholics, but also that contracted by members of the different sects which have retained baptism and validly baptize, is undoubtedly a sacrament. It matters not whether the non-Catholic considers marriage a sacrament or not, or whether he intends to effect a sacrament or not. Provided only he intends to contract a true marriage, and expresses the requisite consent, this intention and this expression are sufficient to constitute a sacrament. But if he is absolutely determined not to effect a sacrament, then, of course, the production of a sacrament would be excluded, but the marriage contract also would be null and void. By Divine ordinance it is essential to Christian marriage that it should be a sacrament; it is not in the power of the contracting parties to eliminate anything from its nature, and a person who has the intention of doing this invalidates the whole ceremony. It is certain, therefore, that marriage contracted between baptized persons is a sacrament, even the so-called mixed marriage between a Catholic and a non-Catholic, provided the non-Catholic has been validly baptized. It is equally certain that marriage between unbaptized persons is not a sacrament in the strict sense of the word.
While it is true that many Non-Catholics and Catholics alike may have entered into an invalid marriage for several reasons including a contraceptive mentality, or entereing into the marriage with the mental state of, “If this does not work out, I can always get a divorce.” Such declarations are left to compitent authorities and not you or me, (Unless you are part of a Diocecan Marriage Tribunal and we don’t know it.) But even so, it would only be when you were given a case to review and decree on under the authority of the local Ordinary. The fact that most Lutherans only hold two Sacraments, or that Some Anglican only believe that two Sacraments exhist and others seven, does not invalidade their marriages. The Church is so sure of this that it requires that a Protestant Convert who is divorced and enters the Church be granted an annulment if they wish to remarry, but if a Pagan converts, they can apply for the Pauline Privilage should their spouse not convert and they wish to end their natural, and non-sacramental marriage and enter into a valid sacramental marriage with a different, (hopefully in this case) Catholic marriage partner.