Why are people prejudiced against Muslims if they don't even know the actual religion?

Islam is NOT a religion of violence and terrorism! Islam itself means peace! Oh, and now your probably thinking "What about 9/11?" That is BS. Those people are NOT Muslims. One of the most important lessons in Islam is "If you murder one man, it will count to Allah (God) as murdering all of humanity. If you save one man, it will count to Allah as saving all humanity." Seriously crack open an encyclopedia or something before you hate us by reading anti-Islam websites. We need to love more in the world.