Can Satan use a believer to accomplish his purposes? Absolutely. Believers can get sucked into ideas and beliefs, whether specific causes, political beliefs, thought patterns, or other ideas, that are demonic in nature. The apostle Paul even warns about this in 2 Timothy chapter 2. This is why knowing God's Word and being able to discern His voice is critical, especially in an era where there is so much deception.
He's known as the accuser, the deceiver, and more. How are we misunderstanding Satan, and how does that impact us today?
The spiritual realm is BURSTING with activity at all times. Just because we can't see it doesn't mean it's not happening. Battles rage. Tensions...
The prince of the power of the air has a lot of influence in our world. Do demons oversee or run nations?