Sikhism was created to protect Hindus from Muslim rulers.

Sikhism was coined by Guru Nanak Dev Ji (1469–1539), the founder of Sikhism. He was the first Sikh Guru, from the northern Indian region of Punjab. The religious practices of Sikhism were formalised by Guru Gobind Singh Ji on the 13 April 1699, when he baptised five initiates from different parts and different social backgrounds to form the Khalsa. The order of Khalsa has a history of more than 300 years.
Sikhism came in conflict with the Mughal laws from the time of the Mughal Emperor Jahangir (1605–1627). The Mughals propagated Islam and killed many Sikhs for refusing to obey their orders. Out of the 10 Sikh gurus, two were tortured and executed (Guru Arjan Dev and Guru Tegh Bahadur), and close kin of several Gurus were brutally killed (including the seven and nine-year old sons of Guru Gobind Singh). Other revered figures of Sikhism like Banda Bahadur (1716), Bhai Mati Das, Bhai Sati Das and Bhai Dayala too were tortured and put to the sword.
The Sikhs militarised themselves itself to oppose the Mughal hegemony. The emergence of the Sikh Confederacy under the misls and Sikh Empire under the reign of the Maharajah Ranjit Singh (1792–1839) was characterised by religious tolerance and pluralism with Christians, Muslims and Hindus in positions of power. The establishment of the Sikh Empire in 1799 is commonly considered the zenith of Sikhism in the political sphere; during its existence (from 1799 to 1849) the Sikh Empire came to include Kashmir, Ladakh, and Peshawar. A number of Muslim and Hindu peasants converted to Sikhism. Hari Singh Nalwa, the Commander-in-Chief of the Sikh army along the North West Frontier from 1825 to 1837, took the boundary of the Sikh Empire to the very mouth of the Khyber Pass. The Sikh Empire’s secular administration integrated innovative military, economic and governmental reforms.
Sikh organizations, including the Chief Khalsa Dewan and Shiromani Akali Dal led by Master Tara Singh, strongly opposed the partition of India, viewing the possibility of the creation of Pakistan as inviting persecution. The months leading up to the partition of India in 1947, saw heavy conflict in the Punjab between Sikhs and Muslims, which saw the effective religious migration of Punjabi Sikhs and Hindus from West Punjab
The Panj Pyare, or the Five Beloved, are the men who, under the leadership of Gobind Singh (1666-1708), the last of the ten Sikh gurus, were initiated into the Khalsa or the brotherhood of the Sikh faith. They have a revered place in the Sikh tradition; their story is also illustrative of the manner in which religious traditions develop, and how a religion comes to place emphasis on the narratological tropes of bravery, loyalty, fearlessness, risk, innovation, and so on.
Sikhs who were keen on escaping the persecution of Islam relapsed into Hinduism, and Sikhs were afraid of openly declaring their faith. In an effort to revive the community, and instil in it the virtues of courage and fearlessness, Guru Gobind Singh hit upon a certain expedient to safeguard the interests of Sikhs. At a gathering of the Sikh community, Guru Gobind Singh asked for five men who would be willing to lay down, at that very moment, their lives for him and the community. No one came forth immediately; thereupon, the Guru exhorted and harangued them, and asked what manner of men they were that they would not act in the larger interest. Finally, a man stepped forth. Gobind Singh took him to a nearby tent, and soon a thud was heard; then the Guru emerged from the tent, his sword dripping with blood. No one doubted that the man had been killed. Then the Guru asked for a second man, but this time, aware of the fate in store for each one of them, no one dared to volunteer. Again, the Guru exhorted them, and declared the end of the community in sight; and, finally, a volunteer came forth. He too was taken into the tent and apparently dispatched into the martyr’s heaven in the same manner; and again the Guru emerged from the tent, his sword dripping with blood. In a similar manner, three other volunteers came forth; but when the Guru took the fifth into the tent, he came out of it with all the five men, and with five decapitated goats. These men, later immortalized in the Sikh faith as the Panj Pyare, or the Five Beloved, were then initiated into the Khalsa, given the name of Singh (lion), and were henceforth enjoined to wear the symbols of the faith, abstain from alcohol and tobacco, and entrusted with the safekeeping of the community.
During the Mughal Empire period, the Sikhs helped protect Hindus from Islamic persecution, and this caused the martyrdom of their Guru. The Sikh movement was rapidly growing in northwest India, and Guru Tegh Bahadur was openly encouraging Sikhs to, “be fearless in their pursuit of just society: he who holds none in fear, nor is afraid of anyone, is acknowledged as a man of true wisdom”. While Guru Tegh Bahadur influence was rising, Aurangzeb had imposed Islamic laws, demolished Hindu schools and temples, and enforced new taxes on non-Muslims.
Guru Tegh Bahadur was the ninth of the Sikh Gurus. The eight Sikh Guru, Guru Har Krishan, nominated hime as the next Guru before he died. Guru Tegh Bahadur was actually the son of the sixth Sikh Guru, Guru Hargobind. He sacrificed himself to protect Hindus. Aurungzeb was forcibly converting Hindus to Muslims. Hindus from Kashmir came to Guru Teg Bahadur for protection and requested for assistance. Guru asked them to tell Aurungzeb that if he will be able to convert Guru Teg Bahadur to Islam then they all become Muslim.
According to records written by Guru Gobind Singh, the Guru had resisted persecution, adopted and promised to protect Kashmiri Hindus. The Guru was summoned to Delhi by Aurangzeb on a pretext, but when he arrived with his colleagues, he was offered, “to abandon his faith, and convert to Islam”. Guru Tegh Bahadur and his colleagues refused, he and his associates were arrested and tortured for many weeks. The Guru himself was beheaded in public. In the place where now stands the Gurdwara Sis Ganj, opposite the Red Fort in Delhi. His martyrdom stands as a towering symbol of the protection of human, civil and religious rights, in an era when no formal institution was there to safeguard them. Not only this, Bhai Mati Das along with his younger brother Bhai Sati Das were martyrs of early Sikh history. Bhai Mati Das, Bhai Dayala, and Bhai Sati Das were executed at a kotwali (police-station) in the Chandni Chowk area of Delhi, under the express orders of Emperor Aurangzeb just before the martyrdom of Guru Tegh Bahadur. Bhai Mati Das was executed by being bound between two pillars and cut in two.
Sikhs have always stood by Hindus and protected their interests . While, Emperor Nader Shah, the Shah of Persia (1736–47) and the founder of the Afsharid dynasty of Persia invaded Northern India, he attacked Delhi in March 1739. His army easily defeated the Mughals at the battle at Karnal and would eventually capture the Mughal capital in the aftermath of the battle. In 1761, Afghan invader Ahmad Shah Abdali crushed the northern expeditionary forces of the Maratha Empire at the Battle of Panipat. Abdali’s troops apparently captured women in India and began transporting them back to Afghanistan as war booty. Till that time, the Sikh Misls, or brigades, had maintained a distance from the two warring sides. But when families of the victim women pleaded for their help, they organised themselves militarily for what came to be known as the great rescue. Under the leadership of Jassa Singh Ahluwalia, designated as Sultan-ul-Qaum, the Khalsa brigades broke the back of Abdali’s troops at the River Sutlej in Goindwal, and rescued 2,200 women and gallantly escorted them back to their families.
Sikhism was formed on human values to fight against the atrocities committed by Islamic rulers in India and by that reason to protect the Hindus because at that time Sikhism was not a separate religion.
The word Hindu was coined by Arabs which was symbolic to the Geographical location i.e. place close and beyond Sindhu river. Even as on date when Muslims from India goes to Mecca for Hajj, they are called Al-Hindi. Thus all the Indians are by origin Hindus only even if they follow different religions or even if they do not believe in God.
Guru Gobind Singhji, started an armed struggle against the violent intruders and to protect our own motherland. Rajputs, after fighting for 800 years, were almost finished. Thereafter Guru Gobind Singhji created an army which started with only five persons, all of them were from Hindu community. His dictum was that there would be no discrimination on the lines of caste, and everyone would be a fighter.
He further gave a clarion call to the entire country that every house holder should send his first son to be a part of Sikh army, a rule that is still followed in Punjab .
Guru Gobind Singhji has said that Sikhs and Hindus are as inseparable as the skin and nail. The portrait of Hindu gods were kept in Gurudwaras, including at Harmandir Sahib in Amritsar.
Guru Gobind Singhji had written in his Atmakatha that in his previous birth he has done Tapasya at Saptashrungi in Himalaya and he worshipped Mahakala and Mahakalika( Shiva Shakti). Looking at the atrocities committed by Muslim invaders, the Lord has asked him to go and defend the dharma. This place is still very popular among Sikh brothers and they have constructed a Gurdwara there. It is near the Valley of Flower where Lord Laxman also did tapasya after killing Meghnad.
All the Sikh gurus were born in Hindu families. Guru Nanak Dev Ji was from a Brahmin family called Bedi/Vedi. His first teaching was “Na koi Hindu Na koi Musalman” ( No one is Hindu and no one is Muslim). He wanted to eradicate the differences of religion but ironically it resulted in the foundation of a new religion! Those who followed the teachings of Guru (Seekh) were termed as Sikhs. After him, all the Sikh Gurus clearly stated in their teachings that Sikhism is to serve humanity and no one else. There are numerous teachings and incidents which prove that Sikhs favour only humanity, not any particular religion. Sikhism is a revealed religion, an altogether different faith itself.

Sikhism was created to protect Hindus from Muslim rulers.