The Catholic Church has NEVER attempted to portray Alexander VI (Rodrigo Borgia) as anything other than the corrupt, depraved and evil monster that he was.
Your attempted analogy makes about as much sense as trying to define the Apostles by Judas Iscariot’s betrayal.
Then if, and that’s only if, all the things said about Calvin are true, and there’s not much reason to think that all of the speculation about him is, then the Calvinists and RCC are one for one.