Major religious groups

The 2015 global percentage of adherents by religion.
  1. Christianity (31.2%)
  2. Islam (24.1%)
  3. Irreligion (16%)
  4. Hinduism (15.1%)
  5. Buddhism (6.9%)
  6. Folk religions (5.7%)
  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.