Emphasize on your friendship. As said before, a friendship is a friendship, no matter what. One of my best friends is a Turkish Muslim, and while we have disagreements on certain things, we don't let anything get between us. Respect your friends opinions. When ever having a discussion, consider their opinion as equal, and that either of us can be right. Avoid sensitive topics. Never bring up some areas of discussion, such as the Israeli-Palestinian conflict, radicalism from each side, Gaza/Lebanon, or general belligerence (hostility) between both sides (Mashhad massacre, Cave of Patriarch shooting, violence encounters between Judaism and Islam are especially risky) Focus on the similarities more than the differences. This is very helpful as it brings up a protagonist effect. Some examples of topics could be Kosher/Halal, Monotheism, and even history. But don't get too risky in your conversations (Circumcision is a no-no.) Learn a little about each other. Study about each others religions, and customs. Always be respectful. Be considerate of your friends family and friends as well. They may not always be as easy to deal with. Always watch your tongue! Always defend your friend.

Unfortunately prejudice is common, and we are all victims of it. If you ever see some ignorant folks beating on your friend, stand up for him or her. Have a great time!!!