Sikhism, or known in Punjabi as Sikhi,[note 1] (/ˈsiːkɨzəm/ or /ˈsɪkɨzəm/; Punjabi: ਸਿੱਖੀ, sikkhī, IPA: [ˈsɪkːʰiː]) is a monotheistic religion founded during the 15th century in the Punjab region of the Indian subcontinent, by Guru Nanak[3] and continued to progress through the ten successive Sikh gurus (the eleventh and last guru being the holy scripture Guru Granth Sahib. The Guru Granth Sahib is a collection of the Sikh Guru's writings that was compiled by the 5th Sikh Guru). It is the fifth-largest organized religion in the world, with approximately 30 million adherents.[4][5] Punjab, India is the only state in the world with a majority Sikh population.