Sikhism was founded by Guru Nanak (1469-1539). The religion was further developed and defined by nine gurus that came after him and has its roots in the Indian sub-continent. Holy scriptures called Guru Granth Sahib have guided adherents spiritually after the ten gurus. Sikhs believe in one Supreme Being.
The key beliefs of Sikhism include:
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Oneness with humanity
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The release from birth-cycles through enlightenment
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Worship, meditation and service
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Rejection of caste system, rituals and idol-worship
Khallsa (baptized) Sikhs are required to follow Reht Maryada (the Sikh code of conduct) at all times. Reht Maryada includes both the religious and social practices for Sikhs. The Sikh calendar was modified in 1999 and has moved from lunar to tropical solar calculations. Some groups within the faith continue to use the previous calendar and therefore some holy day celebrations may vary based on adherents’ affiliations.