Catholic, Muslim, Buahism
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.
Shintoism, Buddhism,and Confucianism are the three main religions in Japan.
The country of India was the birthplace of four religions, including Buddhism, Hinduism, Jainism, and Sikhism. Today, the three main religions followed in India are Hinduism, Islam, and Christianity.
I'd have to say Christianity for certain and with the rise of Islam, then Islam is number two.
   
The main religion in Europe are Christianity, Islam and a little bit of Hinduisim.
The two religions are the two predominant religions today: Catholicism and Protestantism.
The main religions in Peru today are Roman Catholicism and Evangelical Protestantism. There is also a minority presence of other religions such as traditional Andean beliefs and Afro-Peruvian religions.
If you mean Taoism, then one of the other religions is Budhaism.
Judaism, Christianity, & Islam.
jewish, christian, and islamic