Quick Answer: How To Piss Off A Jehovah Witness
They do not salute the national flag or sing the national anthem, and they refuse military service.
They also refuse blood transfusions, even if those transfusions could save their lives.
They believe people outside of their religion simply cease to exist after death.
One of the cardinal rules of talking with Jehovah's Witnesses is to deal with one theological topic at a time.