Final answer:
Approximately 94% of Spain's population is Roman Catholic.
Step-by-step explanation:
Roman Catholicism is the predominant religion in Spain. According to the CultureGrams World Edition, approximately 94% of Spain's population identifies as Roman Catholic. This means that almost the entire population of Spain is affiliated with the Catholic Church. Roman Catholicism has a significant influence on Spanish culture, traditions, and customs.
Learn more about Religion in Spain