The Spanish practice just about any religion known to man. By far the largest religion is Roman Catholic.
The people targeted for their religions were Jews, Muslims, and heretics.
Spain is 94% Roman Catholic. All the other religions only total 6%.    
   
Spain.
70% of Spain is Roman Catholic, 2% other religions,25% no religion. Roman Catholocism is a denomination of Christianity
The main religion of Spain is Catholicism.Well, the main religion in Spain is Catholicism. 94% of the population is Catholic, but they do have other religions there too.
Roman Catholicism makes up a large percentage of the religions practiced in Spain. However, many do not practice religious worship or attend church.
About 75% of Spain is Roman Catholic. About 20% say they are atheists or non-believers.
Spanish people figured they had too many immigrants who had foreign religions. In January 1492 all Islamic people in Spain had to either convert to Catholicism or leave the country. The Jews were given the same deal, with six months to convert, or get out of Spain.
According to the CIA's World Fact Book, Spain is 94% Catholic and 6% other.
All religions are allowed in Spain, although the Roman Catholic Church is, by far, the most popular.
70% of all Spaniards are Roman Catholic which is a denomination of Christianity. 2% other religions,25% no religion