That's also why you can't be forced to say the Pledge of Allegiance: https://en.wikipedia.org/wiki/West_Virginia_State_Board_of_E...

"In the 1930s, the president of the Watch Tower Bible and Tract Society of Pennsylvania, Joseph Franklin Rutherford, began objecting to state laws requiring school students to salute the flag as a means of instilling patriotism, and in 1936 he declared that baptized Jehovah's Witnesses who saluted the flag were breaking their covenant with God and were committing idolatry."