Never heard this one, at least not exactly.
In Judiasm, the child’s religion can be inherited from his or her mother. I have seen many a Jewish man enter a mixed marriage expecting his wife to pick up the ball religiously, when she expected him to pick it up religiously.
But Catholics don’t inherit religion, at least not exactly.
If a priest finds that there is “well founded hope” that a child will be raised Catholic, he should baptize the child. if the priest doesn’t see that for a baby, the baptism should be delayed.
If a child comes from a marriage of mixed
churches, meaning the Catholic Church as a whole (both parties ARE Catholic, just different varieties), but two separate churches (suich as A Latin Catholic woman marries a Byzantine Catholic man), then the child generally inherits the father’s church no matter what in equally valid Catholic church the child is bapitzed. I have to do the research on this one, because I’m not sure where the cite is located.
But if a child comes from parents where one is Catholic and one is something else, say oh Presbyterian or Anglican or Methodist or even Baptist,
the Catholic parent has made a promise that he or she will do everything possible to ensure the child is baptized and brought up Catholic. The non-Catholic partner is made aware of that promise. It doesn’t matter if it is the mother or the father.
A Catholic should not be getting married in only a civil ceremony where those civil ceremonies are required; and where they are not, should ONLY be getting married according to the rites of the Church unless he or she has a dispensation. In any event, it just doesn’t matter. The Catholic should still be doing his or her part to bring any children to the Catholic faith. And children who are baptized in the Catholic Church (capital c) are Catholic, period, no matter their parents’ marital status.