when writing a song if you start in say E minor, do you have to stay in E Minor throughout the whole song
listen, there is no "HAVE TO" in music; some things WILL definetely sound better than others, but do what you want. the people who say you 'have to' are the ones who are obsessed about music theory written 1000 years ago by some fat scholar/monk who prays 9 nine times a day (although this theory does help, and i would suggest you to go read on it)
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The Bible is awesome. Revelation is so badass, I mean, dragons and angels and the devil having an epic battle in the clouds? Badass.