PSacramento: Sure, I understand your point, but is Satan mentioned...
I think we understand each other. Satan is mentioned in many ancient jewish writings, not just in the Bible. That kind of characters, opposing the good and their god(s), appear in holy texts of other cultures too. Yahweh, however, seems to be more paranoid than most other gods.
Wonder if someone (at least the WT has sometimes referred to the apparent honesty of authors...) would use this as an argument for the divine inspiration of the Bible? An autobiography by a dictator does look different from his/her biography written by somebody else.