Guru Granth sahib is a rule book that gives the outline of life in peace times. But it has been commercialized and has become a mean of minting money like any other religion. Sikhism was never a religion Sikhs were created as a wariers to fight against the evil mughal kings. There was nothing against any civil Muslim. don't forget that the foundations of the Golden temple are Laid by a Muslim, the two right hand men of Guru Gobind Sing were Muslims. Gurbani of may a Muslims is included in the Guru Granth sahib most noted is Kabir. And the two right hand men of Guru Nanak were also Muslims, Matter infact the decedent of the deciple Mardana are still alive and do kirtan in Gurudwaras while living in Pakistan. It proves that Sikhs were never against Muslims or their religion but the Evil doings of Moghal kings. Modern day Muslims of India and Pakistan are the converts of that era, either by force or by fear. If Muslims try to trace their ancestry they will find a Hindu connection somewhere in line. Many a Hindu surnames still survive in Muslims Such as Sagoo,Birdi,Shah,Chaudary to name but few.
