I run across a lot of nominal "Christians" who don't think Satan exists anymore... I guess they assume that the incandescent light and indoor plumbling have taken care of Old Scratch. Would that that were the case! God has already kicked Lucifer right in the old everlasting slats, but a believer is delusional if he thinks the devil no longer makes anything but cameo appearances.
The question for me is; In what form is Satan? Some think he's an entity. Others think he's just a term for evil. I still have an open mind in the subject, knowing it is never going to be answered in this life.