I imagine that depends on what those images mean to you, in the context of your own belief system. They would probably mean something different to a Christian than they would to a pagan or an atheist.
Our subconscious mind is responsible for dreams. Sounds like you might be fearing something, loss of friends, loss of faith, maybe feeling out of control in some aspect of your life, repressing something that you are in denial about in your waking life.
The devil and demons probably represent something that is worrying you in real life. So perhaps you have a big project to complete or you think you are in trouble with a friend? The brain works in mysterious ways at times.