Can they still serve as GodParents?
No, they cannot.
Can. 874 §1. To be permitted to take on the function of sponsor a person must:
1/ be designated by the one to be baptized, by the parents or the person who takes their place, or in their absence by the pastor or minister and have the aptitude and intention of fulfilling this function;
2/ have completed the sixteenth year of age, unless the diocesan bishop has established another age, or the pastor or minister has granted an exception for a just cause;
3/ be a Catholic who has been confirmed and has already received the most holy sacrament of the Eucharist and who leads a life of faith in keeping with the function to be taken on;
4/ not be bound by any canonical penalty legitimately imposed or declared;
5/ not be the father or mother of the one to be baptized.
§2. A baptized person who belongs to a non-Catholic ecclesial community is not to participate except together with a Catholic sponsor and then only as a witness of the baptism.
My understanding is that GodParents promise to raise the children in the faith, not necessarily return to it themselves.
Sponsors present the child for baptism and recommend them for the community and vouch for them and their parents, they vow to assist the parents in the formation of the child in the Catholic faith, and they must be members of the Church in good standing to undertake this role.
You have have three candidates for sponsorship who are apostates and/or in schism or heresy at this point in their lives. They are not candidates to be a baptismal sponsor.
I had a Jewish co-worker who is a GodParent to a Catholic child.
Your Jewish friend is quite mistaken. She is not a sponsor to a Catholic child. It’s not possible.
She told the priest she was Jewish and he told her she could be a GodParent if she rejected Satan.
If this is an accurate description of events, the priest was grossly wrong and hopefully out of some sort of blinding ignorance (I’m not sure how that’s possible since seminary formation is quite extensive).
In any case, this Jewish woman is NOT the sponsor of the child in question. If she was the only one selected for that role, then the child actually did not have a sponsor at baptism. Only a Catholic can be a sponsor. And while a sponsor is normative, it is not an absolute requirement for the sacrament.
However, I know cases where non-practicing Catholics were not permitted. Thanks Margaret
Margaret, it is a canon law requirement that a Catholic who is to be a sponsor be a practicing Catholic in good standing with the Church.
This is not merely a recommendation, it is a requirement.
Ask someone in your parish to be the sponsor for your children.