The World is mostly dominated by three faiths, Buddhism, Islam, and Hinduism.
Buddhism-40% of the World (on the map its in Blue)
Islam-30% of the World (on the map its in Green)
Hinduism-20% of the World (on the map its in Orange)
In addition, there are several other smaller faiths,
3% Daiost
3% Confucian
3% Traditional Beliefs
1% Christianity (on the map its in Grey)