Purity-versus-acculturation tension predates and recurs wherever religious groups coexist

Evidence

The Cordovan martyr movement was not the origin of these tensions between purity and segregation on the one hand and toleration and acculturation on the other. Indeed these tensions exist wherever Islam and Christianity (and, for that matter, Judaism) coexist. The martyrs merely provided a particularly dramatic and violent response to these tensions, and in so doing made cooperation nearly impossible (for a time) between Muslim authorities and Christian churchmen. — John V. Tolan, Saracens, 542

Categorization

• XREF: Generalizes the coexistence-tension claim relevant to vault material on Islam-West opposition — the friction is structural to cohabitation, not unique to Islam. — connects to: Ancestry-based purity laws displaced religious conversion as a path to inclusion
• DEEPTHINKING: The insight that violence ‘makes cooperation nearly impossible’ — anger translates looming ambivalence into a decisive rupture — connects to how intense ideologies freeze once-negotiable boundaries.