The Sikh gurus "'the strong and powerful'" established Sikhism, which started as a minor religion, but developed into a prominent religion over the centuries. No guru comes to start a religion, but religions are formed around the teachings, as is the case since the Sikh gurus appeared, beginning in the year 1469.
Guru Nanak was the first of the recognized Sikh gurus. There were ten recognized living gurus in the Nanak line. Modern Sikhism believes the Adi Granth or Granth Sahib, the writings of the gurus, to now be the guru. This belief has been integrated alongside the writings of Sikh gurus, and is now called Guru Granth Sahib. Modern Sikhism says that the Tenth Guru Guru Gobind Singh bestowed the guruship forever to the Guru Granth Sahib.