Sikhism

Today I read about the Sikhs on wiki today and I was amazed with the similarities to Buddhism. They have a non-anthropomorphic concept of god which means that god is everywhere and is all things and they rejected the caste system. I'm starting to get why they are so well accepted and revered both in India and abroad. It's got all this inner searching and reflection as opposed to a "why did god do this to us" attitude and i like it but I still haven't worked out why they wear the turban and beard. I heard once that it was disrespectful to god or some junk but this sounds a little simplistic. I will investigate and report.