While it’d be unfair to compare Sikhs to crusaders, it’s not like there weren’t Sikh states at war (especially with the Mughals. And, uh, the British East India company.)

It’s also important to note much of the Sikh militarism was brought out of self defense- persecution by Muslims and Hindus in particular were pervasive throughout their history; and the handful of states that were specifically Sikh, were mostly short lived.

Suffice it to say, it’s a very modern concept that religions were supposed to be peaceful. For most of history, religion was as much a part of national identity as it was fervent beliefs.

This isn’t to say that members in those religions can’t be absolutely peaceful.