Before I start, I'd like to say that I am a Christian by family and church, however my beliefs stray from those of Christians and Catholics. If perhaps I was given the opportunity to change my religion, I would.
Now, let me explain what I believe about Good and Evil, and then I would ask you to share your own beliefs of the subject.
There are indeed grand concepts in this Universe, such as Good and Evil. It is a great misconception, however, that people think so narrowly of the whole idea. When a person thinks about demons, immediately they think of evil.
Does anyone want to comment on this passage " Those who are ashamed of me and of my words in this adultrous and sinful generation, of them the Son of Man will also be ashamed when he comes in the glory of his Father with the holy angels" Verse 38 NRSV