Major religious groups
The 2015 global percentage of adherents by religion.
- Christianity (31.2%)
- Islam (24.1%)
- Irreligion (16%)
- Hinduism (15.1%)
- Buddhism (6.9%)
- Folk religions (5.7%)
- Other religions (1%)
The world's principal religions and spiritual traditions may be classified into a small number of major groups, though this is not a uniform practice. This theory began in the 18th century with the goal of recognizing the relative degrees of civility in different societies, but this concept of a ranking order has since fallen into disrepute in many contemporary cultures.