Is baptism a form of exorcism, or is that just a Hollywood myth?

I never watched this film, but the synopsis alone is eerie. Read this article . > She then runs to the safety of a church, knowing that baptism is a > form of exorcism. Is this true? Can baptism be a form of protection against Satan? Is Satan really a person, or does this film carry a strong Faustian theme? Why would Satan be afraid of baptism and not a Jewish mikveh? Is baptism made up of holy water?