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.