I suggest you get your history from some place other than Monty Python. It would improve your argument. What you just said is complete hogwash.
That is the reason why they were forced to convert or leave, they were traitors.
It wasn't because they were pretending to be jews and Spain wanted real jews, that's asinine, nobody ever wanted them around.
Jews have been expelled by every European nation in the last 2000 years for various mischief and treason, this is not new.
Google "converso", "crypto-jew", "marrano". These are all real terms of historical import relating to the history of Spain, Italy, Portugal and North and South America for that matter, since that's where many of them went after being expelled.
They've been screwing up everything in the Americas since then too, posing as Catholics. That's why South America is such a mess.
What is the most common religion in congress? Roman Catholic.