Jehovahs Witnesses do not observe holidays they believe to have pagan origins, such as Christmas, Easter, and birthdays. They do not salute the national flag or sing the national anthem, and they refuse military service. They also refuse blood transfusions, even those that could be life saving.

Why cant you give a Jehovahs Witness?

Jehovahs Witnesses believe that it is against Gods will to receive blood and, therefore, they refuse blood transfusions, often even if it is their own blood. However, a minority of Jehovahs Witnesses do not agree that the Bible prohibits blood transfusions, and will therefore accept transfusions.