A well known Myth spread by the venomous Talibani Khalistanis. What they do not tell us is that :
1. Several Sikhs were indeed Brahmins such as Bhai Gurdas, Baba Buddha etc Chhibber (alternatively Chibber or Chhiber) is a Brahmin clan from Kashmiri and settled in Punjab. They are one of the seven clans of the Mohyals who are Saraswat Brahmins of Kashmir. The other six clans are Bali, Bhimwal, Datt/Dutt, Lau, Mohan and Vaid. Punjabi Brahmins other than Mohyals include Barahis (Twelvers), Bawanjais (Fifty-twoers) and Athwans (Eighters). Most Chhibbers are Hindus, and were closely associated with the Gurus, especially the ninth and tenth Gurus, Guru Teg Bahadur and Guru Gobind Singh.
2. Guru Gobindji's teacher & mentor was in fact a Kashmiri Brahmin called Kripa Ram Dutt who was well knowledged in warfare, martial arts, Vedas, Upanishads, sanskrit, Farsee & also fought alongside the Khalsa army & died a martyr for Sanatan Sikhi. He taught the young Guru Gobind Singh all the knowledge of Vedas, warfare & martial arts.
3. Guru Tegh Bahadur's close followers were Kashmiri Pandit Brahmins. Their names were Bhai Sati Dass, Bhai Dayal Dass & Bhai Mati Dass who all were tortured to death by Aurangzeb. They accepted martyrdom instead of being forcibly converted to Islam. They wore the Janeu, tilak & died for Hindu Dharm. It seems Guru Tegh Bahadurji too died for Hindu Dharm, the faith he so much held close to his heart as per his following statement to Aurangzeb:
'Tin te sun Siri Tegh Bahadur
Dharam nibaahan bikhe Bahadur Uttar bhaniyo, dharam hum Hindu
Atipriya ko kin karen nikandu Lok parlok ubhaya sukhani
Aan napahant yahi samani Mat mileen murakh mat loi
Ise tayage pramar soi Hindu dharam rakhe jag mahin
Tumre kare bin se it nahin
~ Guru Tegh Bahadur's reply to Aurangzeb's ordering him to embrace Islam
(In response, Shri Tegh Bahadur says, My religion is Hindu and how can I abandon what is so dear to me? This religion helps you in this world and that, and only a fool would abandon it. God himself is the protector of this religion and no one can destroy it.)