You can find Jews on either side of the conflict, as my tribe could not own land and thus were skilled craftsmen or (especially in Spain and Portugal) sailors, and thus used by whomever was the boss at the time.
Same story since Babylonian times (e.g., Daniel) or even with Pharoah (e.g., the famine) -— we’re useful in keeping the wheels of civilization from failing off.
In Spain, this was no different. For example, Chris Columbus was of Jewish origin (his mother), although it is unclear what his religion was -— probably Catholic.
And then, for the other side, go read “Jewish Pirates of the Caribbean” — a plurality of the nastiest raiders were Jewish.
And yes, Jewish people lent money to the Spanish crown to fight the muslims, so there is always this motive.
Why did an image of Mel Brooks flash into my mind?
On a serious note, living in New Mexico, it is an interesting subject.