I am going to go out on a limb here...but is Sikh religion not Muslim friendly?
Reverse the precepts, and you've got it.............
They do not play well together.
Sikhs traditionally served the British Empire as cops (in Hong Kong, for instance) or soldiers. Sikhs do not attempt to spread their faith by the sword, but they are religously warriors. They don’t take any shiite from anyone. They are NOT passive like Hindus, or most Christian sects.
Army was created from Brave Hindus to protect weak Hindus from Islamist aggression. Later they formed into religion. Till early 20th century, Hindus in Punjab used to give eldest son to Sikhism to protect other Hindus. But this practice completely stopped after 1970s, after some Sikhs got involved in terrorism and started killing Hindus.
Sikhism is in decline due to lack of conversion, abortion and female infanticide.
To the best of my knowledge, there have not been any major conflicts between Sikhs and Christians. Or Sikhs and Jews.
However Sikhs and Muslims are like oil and water.