Christendom had one religious minority, Islam had many

Evidence

In Christendom, which until the dawn of the modern era substantially meant Europe, Jews were the only religious minority in an otherwise religiously and to large extent even racially homogeneous society. The Islamic world on the contrary was international, one might say interconti­ nental, embracing peoples in Asia, Africa and Europe; they formed a pluralistic and varied society in which Jews were one among a number of minorities and for the most part not the most important and certainly not, in Muslim eyes, the most dangerous. — Bernard Lewis, From Babel to Dragomans, 325

Categorization

• CANDY: A compact, self-contained contrast explaining why Jewish minority status differed between Christendom and Islam — usable elevator-conversation material.