Here's 6 that came off the top of my head...
1.) The message and the Guru is Universal and is for humanity, not just the Sikhs.
2.) Only religion to have a "Prophet" that died not just for its own community but for humanity at large. (Guru Teghbahadur's Shaheedi) (Jesus was martyred for his right to believe and say what he said, Guru Teghbahadur was martyred for people's right in general to believe in what they want)
3.) Only religion with a "Prophet" to travel as far and wide as from East Asia to Middle East. (Google up the Time magazine which showed a graph of the world's most traveled people in which Guru Nanak Dev Ji was number 3).
4.) Only religion to have a langar system in which free food is served to anyone who comes to the Gurduara and they don't even have to attend the congregation. It is irrespective of any race, religion, color, creed, ethnicity, etc.
5.) It teaches to live a life of a saint-warrior, at peace internally and externally, and always ready to stand up for justice in any means necessary (with arms being the last of them)
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=15642Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=15642
6.) Brought into practice the equality of man and woman much ahead of its time.