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%.    
Muslims, Christians (who were all Catholics at this point) and Jews, in order of population numbers.
Shintoism, Buddhism,and Confucianism are the three main religions in Japan.
If you mean Taoism, then one of the other religions is Budhaism.
Judaism, Christianity and Islam
Islam, Buddhism, Catholicism.
jewish, christian, and islamic
Judaism, Christianity, & Islam.
They have three main religions Christianity, Islam, and African religion.
The Three main religions of the world are Islam, Judaism and Christianity. They are all Abrahamic religions.
The three main religions of the region are Christianity, Islam, and Judaism. These religions have deep historical roots in the region and continue to be significant influences on its culture and society.