Don't do it. I really understand the temptation to do so. But don't do it.
Unless you plan to have your quite mortal hero realize it's a hopeless battle and ultimately get that thrashing they've been needing.
I got to writing this because a while ago, I had a REALLY pointless but fascinating debate as to why villains such as Buffy's "First Evil" are pretty much the worst thing ever, and I'm reposting it here due to the pretty awesome responses I saw in the "Devil or Ego" thread.
And here's where we get to the good part.
The First Evil was a unique entity that predated man and demon, apparently the personification of the concept of evil itself, manifested from all evil in existence. The First was an incorporeal presence that could assume the form of any person who had died, including vampires and persons who had been resurrected. Because of this it appeared in various forms depending who it sought to manipulate.
Frankly, sounds a LOT like a certain fallen angel.
Do you know who I'm talking about?
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...any idea at all?
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...It's Lucifer.
Stop being so secular and modern and go read some books.
Anyway.
The Book of Revelations (and to be fair, MOST religious end-of-the-world scenarios) makes it pretty clear who is to triumph over the Evil One. (hint: it's not a mortal)
By having your mortal and imperfect hero triumph over Lucifer/Ahriman/Iblis/The First Evil/The Cosmic Killer Chicken/Whatever-else-you've-come-up-with-in-your-cleverness, you've just put your (still mortal ind imperfect) hero on more or less equal footing with the Almighty, at least when it comes to triumphing over evil.
Which, if that were possible, removes pretty much any need for God in the first place.
"No thanks old man, we got this one in the bag."For most writers seeking to reach a wide audience, it's understandable why it's written that way: to avoid offending people who hold a different set of beliefs by simply glossing over the subject of divinity. But as someone who has routinely struggled with thoughts of damnation and judgment, removing God from the equation is about the same as cutting your anchor line when you're rock climbing and 300 feet from the ground: if you're wrong, it's one HELL of a fall.
It's not so offensive to me that this is done as it is disappointing. It's short-sighted, and utterly fails to understand why religions believe what they do the way that they do.
The thing about Supreme Evils in any religion is the purpose they serve in the narrative of the universe.
They are not so much "challenges to be overcome" as "trials to be endured", and frequently a mark of your faith is how well you endure that trial.
Whether the evil doles out suffering or temptation, the point is that they are impossible to overcome by your efforts alone, however grand those efforts may be. The Supreme Evil is 'Supreme' precisely BECAUSE they cannot be defeated by man. It takes a Supreme Good to defeat a Supreme Evil, and that, I'm sorry to say for all the writers in the entertainment industry, would be more or less exactly what mankind is NOT.
If mankind could defeat a Supreme Evil, we've automatically proven it wasn't quite so supreme after all.
The Dante's Inferno anime film gets a notable kudo for this, because at the end, Dante realizes that all his efforts to defeat Lucifer will be useless, and in the end, he does truly need God, and so he gets on his knees... and PRAYS.
He apologizes for every slight he's made against God, and is willing to trade his own damnation to save everything he cares about.
Which is far more meaningful and poetic than selling your soul to the Devil to save "person you care about X" or "gain superpower Y", when you think about it.
And just because Dante was willing to make that ultimate sacrifice, God not only puts Lucifer in his place, but He also gives Dante a shot at the redemption he didn't believe he deserved as the movie ends.
This was an amazing ending, just by virtue of being so unexpected.
You expect Dante to pull off some incredibly over the top and badass move, and smack down the Devil like the hand of, well... God. Kind of like what happened in the game.
Yet here was Dante, portrayed as a Crusader, doing something a good Crusader should be expected to do: seeking God's help with a greater foe than he can manage.
It was refreshing, and surprisingly satisfying.
Contrast: Buffy the Vampire Slayer's ending. Which was horrible.
Buffy and her friends are in a pinch. The First Evil has it's Turok-Han (or really really badass vampire) army utterly DESTROYING the forces of Good left and right, as the First simply gloats over its apparent victory.
It would take a miracle to triumph here.
And a miracle happens. But is it God? No. The forces of good turn to a witch (albeit an extremely cute and likable one) who uses pagan magic to trigger a Deus Ex Machina (that in reality leaves the "Deus" bit out), that turns every potential slayer into an actual slayer. And then a further miracle and Deus-less Ex Machina happens (one that is even less well explained), when Spike arrives and his magical amulet just HAPPENS to spread the sunlight around, killing all the vampires and... somehow collapsing the cave they were all in, but not before everyone but Spike gets to safety. This foils the First's plans. Plans that it had set in motion hundreds, if not thousands, of years prior.
I get that the show was just trying to wrap up a seven year story in the next 15 minutes and needed something to finish it, and fast.
But in a show so inundated with Christian imagery (crosses and other Christian symbols abound throughout), the show never bothers to address WHY those symbols work against the forces of evil.
God is utterly ignored in the finale, as He has been for literally the entire series, and it is a disheartening trend in this kind of show.
Buffy DID dodge a bullet by not actually killing the First Evil, I'll admit, but the show still missed the point of a Supreme Evil as a "trial to be endured", and treated it instead as a "challenge to be overcome".
At the end of the day, our (yes, still mortal and imperfect) heroes triumphed over Supreme Evil, and proceeded to witty banter like it ain't no thang.
Mankind is able to use magic, half-demons, repentant demons, or basically anything but God to triumph over the Supreme Evil of whatever show you happen to be watching. But Neilson Ratings help you should you mention that God may have had anything to do with the hero's victory.
If you're going to cut God, then by all means, feel inclined to cut the Supreme Evil Ol' Whatshisname, because people shouldn't be able to triumph over such beings anyway.
By that same token, if you're going to include Supreme Evil Ol' Whatshisname, then please don't leave God out of it. It doesn't matter if you call Him Yahweh, Jehova, Allah, or Steve the Creator. Just have Him in there to lend the needed perspective.