By the year 2000, approximately 53% of the world's population were part of one of the three main Abrahamic religions (33% Christian, 20% Islam, less than 1% Judaism), 6% with Buddhism, 13% with Hinduism, 6% with traditional Chinese religion, 7% with various other religions, and less than 15% as non-religious. Most of these religious beliefs involve God or gods. Some religions do not believe in a god or do not include the concept of gods.