Blind spirituality: Superstitions and rituals should not be observed or followed, including pilgrimages, fasting and ritual purification; circumcision; idols & grave worship; compulsory wearing of the veil for women; etc.

This is probably one of the things that surprised me the most. Other religions put these things first, Sikhism just bans them outright. You'd think a religion that doesn't reinforce its importance with obtrusive rituals wouldn't survive but here it is alive and kicking ass.