>>213482554 (OP)
They used to be it. Galicia, Asturias, and Cantabria retained their Celtic languages and some of Celtic pagan practices until the 5th–6th centuries, as noted by the Councils of Toledo. In contrast, the Basques uniquely resisted cultural assimilation, preserving their language and paganism well into the 11th–12th centuries. This highlights the region’s long-standing linguistic and religious resilience against Latinization, Orientalization and Christianization when compared to other regions.