Study of some elements in new Hispanic Christian doctrines of the 8th century, among them Félix de Urgel’s adoptionist doctrines, which can be attributed to indirect influences derived from the beliefs of Muslims, who had recently settled down in Hispania (Al-Andalus). Modern scholars’ opinions. How Christian theologians justified these new elements with traditional Christian texts, when they accepted them, and how they accused them of being Judaizing, when they rejected them. Three appendixes: 1. on the importance of getting to know Félix de Urgel episcopal hierarchical dependences, so that we can understand his religious role, between Visigothic and Mozarabic Toledo’s metropolitan authority and Carolingian Narbonne’s authority; 2. previou...