More than a few other posters have answered this question quite well, but I'll throw my $.02 in anyway.
1) Do you guys have friends who are not of your religion?
No. If i have any friends that are "in the world" they would make me worship Satan. See, if I were to have friends who weren't JW's I wouldn't be strong enough to resist being pulled to the "other side."
2) If that person is a good human being but from a different faith will you guys have a issue?
No, as long as he is willing to be a JW. If not, then he/she is in the world and I'll have to never talk to him again. See #1
3) are you guys open to new beliefs?
Sure. I bet you'd be surprised the amount of new beliefs we are open to. We like to call them "new light" though. Man, we get "new light" all the time, some of it even effects the lives of JW's like blood issues and organ transplants. But we are willing to change, heck we even change back and forth every few years. Now I ask you, what other religion is THAT open to new beliefs???