[maldusiecle]

The forcible conversion of Jews in Spain was in fact one of the first points where Jews were treated as a racial rather than religious category. There's a bit of detail on this in the Wikipedia page for Limpieza de sangre: https://en.wikipedia.org/wiki/Limpieza_de_sangre

Some of this happened more towards the Renaissance than the middle ages, of course, but it certainly disproves this rosy and ahistorical view of the Spanish Inquisition.