Lyric discussion by Black_Sabath 

Cover art for Tyrant lyrics by Judas Priest

It's about a tyrant, IT HAS NOTHING TO DO WITH RELIGION!

that's correct. there is an interview in which Rob Halford discusses his lyric writing. Providing an example of his style, he says that "Tyrant" is a song about a tyrant that expresses his antipathy for tyranny and despotism, but allows the listener to fill in the blanks and create in his or her own mind a scene, plot, story, picture, or what have you.