Yes, Satan exists.
But in both popular and Christian culture, Satan has been profoundly misrepresented. It’s intentional. Like Sunzi said in The Art of War, all warfare is based on deception. True of spiritual warfare as well. The devil gets a leg up on us humans by making us believe all sorts of disinformation.
Like the popular rubbish that it used to be the highest angel in heaven, second to God himself. There’s no evidence at all for this in the scriptures; it’s entirely taken from Paradise Lost. Yet people still claim it’s in the bible somewhere, and come up with the darnedest proof texts as “evidence.” Talk about lying on your résumé; in fact if you were hiring Satan at your business and found absolutely nothing in a background check, you’d be far more likely to believe your applicant’s a dirty liar, than people do Satan—who’s a known dirty liar.
But a mighty successful one. Which is why Christians still think it’s an angel of light, instead of how Paul and Timothy actually described it: Only appearing to be one. 2Co 11.14 Like how it rules this world Lk 4.5-6 as the prince of the power of the air, Ep 2.2 and never imagine these are titles it usurps, ’cause Jesus has conquered the world. Like how it appears to be everywhere, almost like God… or that it’s not almighty, but it’s still pretty darned mighty.
And other such things which intimidate Christians against resisting or fighting it. Or make us so wary of it, we never refer to it by name. Various Christians never refer to it as the devil or Satan; they’ll only call it “the enemy.” Lest saying its name or title might get its attention or conjure it up, like Voldemort from the Harry Potter novels.
Or on the opposite extreme, people might consider Satan laughable. Pagans especially. They imagine it a red creature with horns, goat legs, a tail, and a trident. It sits on your shoulder, opposite an angel on your other shoulder, and goads you into doing what’s fun while the shoulder angel convinces you to do what’s right. It tortures people in the underworld, and sometimes ventures to the surface to tempt musicians with awesome heavy metal songs. It’s an imaginary being, like fairies and gnomes and Smurfs and mermaids. It’s a representation of evil, but it’s not a literal being. It’s silly.
We Christians believe there’s an actual devil. Jesus taught us it exists, Lk 8.12 and told his students it actually came to test him once. (How else do you think Matthew and Luke contain that story?—Jesus told it.)
But contrary to the paranoid fantasies of dark Christians, it’s not a mighty being. It’s a defeated foe. Jesus beat it, 1Jn 3.8 and someday will destroy it. Rv 20.10 Meanwhile he gave his followers—us—power over it. Lk 10.19 If we submit to God and resist it, it’ll flee. Jm 4.7
Yeah, that’s correct: Flee. It can’t withstand us. The only reason we think it can, is because we won’t submit to God. We’re more likely submit to Satan. We fold like a desk lamp. We capitulate.
Our situation is like a trained elephant on a leash. Why don’t elephants snap the leash, or take off and drag their handlers wherever they please? Because they were trained all their lives to obey humans. Frighten an elephant badly enough and then you’ll see ’em snap leashes, drag people behind them, even maul their handlers. The devil has humans on a very similar leash, hoping we never, ever notice how thin it is. How easy it is to fight back. Especially with the weapons the Holy Spirit offers us.
Various new Christians wanna know why God doesn’t just put a stop to the devil. He doesn’t have to! He empowered us to. We can.
Whenever Christians get off our apathetic backsides, or quit being scared for no good reason, we easily overthrow Satan. It’s so quickly defeated, people get surprised: “You mean the fight’s over?” No knock-down, drag-out, end-of-the-TV-season battle with the Big Bad where anything can happen (and come on; on most TV shows you know the good guy’s gonna win). Satan flees like a cockroach when the lights turn on.
Humans (and our fears) are way harder to fight off.