About 83 percent of the world's population is usually thought to be the percentage of religious people in the whole world. As huge as this is, just a few religions out of about 4300 other religions are known all over the world, the remaining ones are just existing as religious organizations with certain religious beliefs.
One of the things that are common to all the major religions in the world is that they all have a good number of followers, and some of them are practiced in different parts of the world. For example, the two most practiced religions in the whole world are Christianity and Islam.
Both religions are practiced in different parts of the world, unlike religions like Buddhism, Shintoism, Hinduism, Sikhism, Judaism, which are not well followed in all parts of the world, however, they are usually considered to be parts of the major religions because each of them has a good number of followers.