So the early Catholics and the Muslims have a lot in common.
The Inquisition was started to clear out Islam from the Iberian Peninsula, and then went overzealous. So not so much.
Eh. Some of my ancestors were Spanish Jews who left Spain for Holland after 1492. The problem posed by the Jews was that they had become administrators for the caliphs, and were part of the enemy apparatus—which for the previous 700 years had ransacked and destroyed churches, forbidden the practice of Christianity, and of course, killed and enslaved Christians across North Africa (which had been Christian since the Roman Empire), Spain, and into France.
What this this article refers to chastely as Ferdinand and Isabella's "conquest of Granada" was the last step in the re-conquest of Spain to repel invaders and totalitarian occupiers. Too bad they didn't chase the Moors back through North Africa to Saudi Arabia. It might have prevented some future problems.
So let's see. In 1945, the French shaved Nazi collaborators' heads and shot them. In 1492, the Spanish Jews could convert or leave. It they falsely converted and stayed, that was considered a crime. It was a genuinely difficult situation for everyone all around, but certainly not capricious cruelty—much as this anti-Christian, anti-Zionist publication would like to pretend otherwise. I'm glad my ancestors headed for the boats. Lord knows, they did just fine in Holland and America.
No, the Catholic Church does do institutionalize murder and lies as core beliefs. Surely, the MEN who acted as Inquisitors were wrong in using torture and death as means to an end. Given the Mohammedan defeat and the proliferation of heresies, it is understandable that they acted AT THAT TIME as they did.
Too often we view history with eyes of modern man, instead of conditions that were prevalent at the time the events occurred.
Not just early Catholics. Both groups today worship Mary.