More than 70 percent of Americans believe the devil is alive and well, and born-again pastor Franklin Battle is one of them. For this Baptist-raised church leader, there is a constant war going on between the kingdom of Satan and the kingdom of God. Each day, Pastor Battle is on the front lines with his non-denominational congregation, calling upon the power of Christ to cast out demons from tortured souls in what is known as deliverance ministry.

Journalist Lisa Ling is offered a glimpse into this controversial world for the upcoming season premiere of "Our America with Lisa Ling." She travels to Georgia to meet with Pastor Battle at Upper Room Church, where she learns about the process for exorcising a demon from someone.

"We'll begin to have a conversation with the demonic spirit inside," Pastor Battle says in the above video. "The spirit can actually talk out of that person's mouth. That's what we call 'manifestation.'"

During her visit, Ling witnesses the deliverance of a woman named Fiette.

Fiette writhes on the ground and speaks in tongues as Pastor Battle questions the demonic spirit. "What do you do to her?" he asks.

"I run her mind," Fiette says quietly before her voice turns into screeches. "I take all her joy away! I make her not want to be around her children."

As Pastor Battle commands the demon to leave Fiette's body, she begins coughing on the floor. The pastor says this is an essential part of the process.

"If you look at demonic spirits as being spirits on air, how do we get air out of our bodies?" he asks. "Through breaths or strong coughs from the stomach. Force, meet force."