Satan is known to the Christian religion as The Prince of Insufficient Light. If the supernatural people surrounding Christianity are real; God, Jesus, Satan, there's no reason to assume that God isn't a power hungry dictator in Heaven and that he only has the best in mind for you. Here are some observations:
-Dirty, dirty love-
Satan wants people to love each other, God wants all the love to himself.
-Conscience-
Satan tempts Eve in the Garden of Eden, to eat the fruit of the tree of knowledge of good and evil (conscience). Exactly what is bad about knowing the difference between good and evil (on the other hand, only an idiot would believe the Adam and Eve fable, knowing it stems from Sumerian mythology, aside from sounding completely rediculous and contradicting modern science)?
-The Virtue of Skepticism-
The best way a force of evil could deceive you adequately for a long period of time (if they were really determined) would be to fill you with lies and then tell you that thinking skeptically about them would be wrong and sending you down a bad path. They would tell you to have faith in the lies even when there's no good evidence for them. Really good lies indeed can make you feel special and fuzzy inside (how do children feel about Santa Claus, a fun lie, but a lie nonetheless?).
-Unconditional Love for Dear Leader-
Kim Jong-il demands love and respect from his people or else he may shoot them (or in God's case, send them to Hell for eternity).
-Scapegoats-
If you're a conservative Christian, you'd be in Heaven in Nazi Germany. There were scapegoats galore. Feeling neophobic because contemporary families are being as accepted as traditional ones? Blame sexual impurity! Nothing like persecuting the homosexual minority. A problem with the economy? It's a Jewish conspiracy! Feeling unsafe because of crime rates? It's those dirty gypsies. Anything to keep things from being complicated and difficult.
The president-elect of the Christian Coalition of America, Rev. Joel Hunter, resigned because he wanted to pursue issues like poverty and the environment, but they refused to acknowledge his wishes because opposing same-sex marriage and abortion are more important to them (not to mention an easier political device to use). If a child having two parents of the same sex does any damage to it at all, living in poverty and an unclean environment does much, much more. But why try and bring up issues that matter when you have a perfectly good scapegoat you can use to control the masses, right?
-Sadistic Killer-
One thing used against God is his murder or order to murder millions of people in the Bible. Satan never harmed people. He convinced God to send multiple plagues to Job, a good person, though. I think that fable is written by Satan to show that God would destroy someone's life just to prove something to someone, but it was flipped around by God's evil minions.
Well, anyway, the point of all this is that there's no way to know that there wasn't some bad event in history which turned the forces of good and evil around. There's nothing to prove that Muslims, Jews, Christians, Hindus, and Sikhs are worshiping the god or gods it would be in their best interest to praise; the spiritual realm is invisible to humans and
nobody has come back from the dead to share their experiences with the afterlife.