It sounds like the deacon means your marriage was invalid because you were not married to this Catholic man in accordance with the laws of the Catholic Church. His baptismal record would show that he was never married “in the Church”.
ur1stkid,
SMHW seems to have hit it on the nose – at the time of your marriage, your ex (as a Catholic) was required to follow the form for marrying “in the Church”. (As a Baptist at the time, you were under no such requirement.) This requirement means that either he must be married at a Catholic Church or gotten permission from the diocese to have the wedding elsewhere (e.g., your Baptist church).
We’re presuming, given your question, that you
weren’t married in a service in a Catholic Church. Right? So, the presumption is that he got permission to have the wedding elsewhere. This permission, when provided, will be noted on his baptismal record. (That’s why they’re asking for his baptismal info, and not for yours. In this situation, your baptismal information isn’t relevant, except that it demonstrates that you were not a Catholic at the time of the wedding.) If his baptismal record shows no such permission, then you’ve established the facts necessary for a “lack of form nullity”.
Do you know what parish he was a member of when you married? At the very least, you should know what diocese he was a member of, right? Perhaps you could contact the tribunal / department for canon law affairs of that diocese, and see what guidance they might be able to provide.
In any case, you might want to talk with your pastor (unless, of course, it was your pastor who referred you to the deacon). Provide them with whatever info you have (ex’s place of birth, his childhood parish or town, his parish at the time of the wedding), and see what advice they can give you. If you run into a brick wall, then a call to your diocese’s Tribunal, asking for a meeting to discuss how you might proceed, might be a good course of action.
I’ll keep you in my prayers!
Blessings,
G.