The Bible has guidelines on how to treat foreigners, to which we should abide. The last thing you need to worry about, from a real Sikh, is any intent on harming you. You could walk through a Sikh neighborhood at 2am and come out unharmed.
Heck, you could walk in the worst neighborhood in South Chicago with a Sikh by your side and come out, not only unharmed, but a neighborhood cleaned up of some criminals.