Since Satan can’t create outcomes apart from human choice or God’s allowance, scripture refers to him “like a god” with a lower-case g. This should not be overlooked. A biblical worldview does not support the idea of Satan possessing autonomous authority to grant fame, fortune, or power in exchange for a human soul. His power is real but limited. Ultimate sovereignty belongs to God alone, who rules in heaven and earth and grants authority according to His will as stated in Danel 4:17.
This raises another important question. Is it sin or the devil that the unbeliever is directly serving? Going back to Romans 6:16, which states “you are slaves to the one you obey” (NIV). Is obeying your sinful nature the equivalent of directly obeying the devil? The short answer to this is no. Since the fall of Adam and Eve, humans do not need the outside influences of the devil to sin against God. We are born into sin with a fallen nature and need a deliverer.