The tahrif forgery debate was geographically driven by Iberian contact
Evidence
On the Islamic side the protagonist of the literal interpretation of tahrif, i.e. that Christians had literally forged the Gospel, Abd: Muhammad “Ali ibn Hazm (d. 1064), was a Spaniard, so that it is not surprising to find that Spanish Christians (followed by Ricoldo), argued against literal forgery, superfluously, as it may seem to us. — Norman Daniel, Islam and the West, 1967
Categorization
Category: Factual Claims