Answer
The three main and most known Religions in the world are:
Christianity- a total of around 2 billion followers
Islam- around 1 billion and two-hundred and fifty followers
Judaism- Near fourteen million people
Answer
According to Adherents.com, the three major world religions are:
The Three main religions of the world are Islam, Judaism and Christianity. They are all Abrahamic religions.
Shintoism, Buddhism,and Confucianism are the three main religions in Japan.
   
1. Christianity 2.1 billion 2. Islam 1.5 billion 3. secular/nonreligious/agnostic/atheist 1.1 billion
If you mean Taoism, then one of the other religions is Budhaism.
The five main world religions are Christianity, Judaism, Muslim , Hindu, and Buddhism.
Judaism, Christianity and Islam
Islam, Buddhism, Catholicism.
jewish, christian, and islamic
Judaism, Christianity, & Islam.
They have three main religions Christianity, Islam, and African religion.
There are hundreds of religions in the world. The main religions per number of religion believers are:ChristianityIslamBuddhismHinduismSikhism