Theology branded Muslims as tainted collaborators with Jews against Christendom

Evidence

Throughout the Middle Ages, Muslims were often described as “tainted with Judaism.” Christian theologians argued that both Jewish and Muslim religious practices were flawed and heretical, and furthermore, that they were collaborators, either in conspiring to undo the Church or—and this is where the monsters often appear—mutilating and killing Christian men, women, and children. Renaissance paintings of the crucifixion, the martyrdom of saints, and other scenes often feature Jewish and Muslim (typically, Turkish) figures participating in these crimes. — Sophia Rose Arjana, Muslims in the Western Imagination, 163

Categorization

• XREF: Connects to the projection thesis - the monster as container for the fear of heresy and conspiracy against the Church.