Well by "devil worshiper" I am going to assume you mean to imply those whom worship Satan Lucifer as a God?
But what you should know about Satanism is that its (true/spiritual satanism) is not about committing illegal acts in fact they are damned. Its about learning and free thinking. And being in control of your path.
And since you used the particular term "devil ..." I will also assume you mean the Psuedo satanists. That have in fact came to being from the Christian Religion / Jew Programs. Well I don't really care what they are for them because in reality there a mentally unstable individual who needs psychiatric help.
But if your intrested in the Benevolent forms of satanism theres really two choices.
Atheistic
Anton LaVey's The Black Bible is his book
Theistic
theres some debate here but i prefer the JoyOfSatan.com (true to satanism and not having a book) and if your not interested that's fine.
Yes she is a devil worshiper
i think usher is not a devil worshiper
he is not a devil worshiper
Worship the devil.
no
No.
devil worshiper?? No i think you would be the only person that knows jay-z is a devil worshiper.. bet he hasn't got a clue about that himself.. jeeeezzzz!!!
no
No
Kanye is not
no.
No, way! You would not be considered a Christian, but instead a devil worshiper. Even if you call yourself a Christian, in the eyes of God, you are a worshiper of the devil.