I think they would still be baptized. The Jewish faith had a baptism of repentance. I don’t see that the Catholic Baptism conflicts with that — in fact, I believe it goes farther than just repentance.
I was brought up in the Lutheran church but I was curious as to what the Catholic Church had to say.
Like Zionist Conspirator I’m a Noahide (I “converted” to Judaism through the Reform movement which is so far from being Jewish).
The Liberal attitudes at my synagogue make me want to scream and/or vomit.