But creation needs a devil
The devil needs an advocate, I guess
Creation is everything outside of Heaven and it is inherently imperfect. Because creating is imperfect there must be evil present and God must not be the only force acting on this realm. Therefore, the devil (the supreme evil force) must be acting on creation. This idea continues the theme of dualism within the song and justifies the dog-eat-dog scenario introduced in the first few lines.
The piece about playing the devil’s advocate (one who argues for the less-accepted side) is interesting though, because B.o.B is saying that he feels a need to argue against the norms of this imperfect creation which he describes.
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