Sikhism  is the youngest of the World religions. Its history dates back to 1469. Its  founder Guru Nanak Dev was born in a village called Talwandi, now known as Nankana Sahib in Pakistan, in 1469. The  Sikhs have ten Gurus. It is believed that they all had same soul though they had  different bodies, and that it was Guru Nanak Dev's spirit which passed on into his nine successors. The  Sikhs call God as 'Waheguru', meaning that God is great. Their common salutation  is "Sat Siri Akal" (God is supreme and is immortal). Some Sikhs say, "Waheguru  ji ka Khalsa, Waheguru ji ki Fateh" (God belongs to the Khalsa and God is invincible). Guru Granth Sahib is the holy book of the Sikhs. It is believed that the tenth Guru,  Guru Gobind Singh bestowed upon the Granth the title of the Guru. The  Sikhs worship only one Almighty God in his abstract form. They are not allowed  to worship any idols, images or photographs. According  to the Sikh belief, God is the eternal truth; he is beyond fear, enmity and death. He is unborn and is self illuminated. He himself is the creator, preserver and destroyer. The  Sikhs believe that all existence is controlled by one omnipotent, omnipresent  and omniscient Lord called by different names: Ishwar, Jehovah, Allah and Waheguru.