it all started with Guru Nanak ..he was an admirer of Muslims ...Guru Nanak went to Mecca to learn things but when he came back he started his version of Islam...this didn't go well with Mogul Muslim emperors who were ruling India..but tolerated...unlike Islam ,Guru Nanak had subsequent prophets called Guru ..until that last one 10th who proclaimed himself as Guru Gobind Singh ...during his period the mogul Muslim emperor was Aurangazeb ..he is a very very holy one ...than the war started between Muslims and Sikhs ...Guru Gobind Singh introduced martial laws ,one of them is not shaving and wearing a turban till all Muslims died ...it is also mandatory for Sikhs to carry a sword all the time
Sikhs holy temples are called Gurduwara ...go and take a look at some in sinkie..the biggest is at Silat Rd ,from outside will look exactly like a mosque ...inside absolutely no idols like Hindus or chinese...even their beard and turbans almost like Osama bin Laden....mistaken for Muslims in US and attacked