the major religion is Christianity.
According to an October 2011 study by the Spanish Center of Sociological Research about 70.1% of Spaniards self-identify as Catholics, 2.7% other faith, and about 25% identify with no religion
Spain does not have an official religion. The largest religion of Spain is Roman Catholic (94%). Others are practiced but are minorities. Almost any religion known is practiced. It just depends on the number of followers.
Roman Catholic, Islam, and Protestant are the 3 major religions in Spain. Keep in mind that the country is 94% Roman Catholic so that the other 2 religions are not too influential.
   
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.
Spain is 94% Roman Catholic. All the other religions only total 6%.    
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Muslims, Christians (who were all Catholics at this point) and Jews, in order of population numbers.
Hindu, Islam, and i think Jainism
christianity (catholics ), judaism and islam
Madrid, Barcelona, Valencia
Spain.
70% of Spain is Roman Catholic, 2% other religions,25% no religion. Roman Catholocism is a denomination of Christianity
Just like every major city you'll find all religions represented however Spain (and Barcelona) are very Roman Catholic and this is the main faith practised in Barcelona.
There are 3 major religions in Jerusalem : Judaism, Christianity, and Islam.