I am Roman Catholic...
... and Doom is my all-time, every-time, hands-down, favorite game! It's actually the only game I play right now. XD
Here's why many Christians hate the game, besides the violence and imagery:
At its very worst, it's very misleading. It appears to redefine just about everything pertaining to Hell, demons, and the Devil. They turn demons from intelligent calculating malevolent supernatural forces into mindless brutish brutal physical entities that want nothing more than to kill, kill, and kill. For Satan, there is actually no direct mention of the Devil in Doom either (though it could possibly be implied that the Icon Of Sin is in fact the Devil himself). And then Hell is merely a physical dimension people can go to and come from, where these strange eldritch horrors reside... a mindless wasteland of gore, carnage, death, and decay... a gruesome world of blood, bone, flesh, and fire... as opposed to what's essentially a "prison cell" for those who actively rejected God in their actions in life and chose to separate themselves from Him.
- Hellfire is actually the fire of God's love and glory. It's proof of His presence which can be sensed even in Hell, because He is omnipresent. That's why the inhabitants of Hell feel extreme pain from this fire... because it's the love and glory of God cast down upon these unfortunate souls who have decided to forever hate and despise their Creator. It's proof that God loves all of his Creation, even if they've descended into Hell, and has not stopped loving them. He loves them so much He's willing to give people what they so choose instead of forcing them to go the right way.
- Lucifer (also known as Satan) is a Seraph (plural - Seraphim; literally meaning "Burning Ones"). An angel of the highest order. Their most notable features are their six wings (two of which they use to fly, two to cover their faces, and two to cover their feet, all while they sing praise) and flame enveloping their bodies. They are the keepers of God's Throne. Even more than that, Lucifer was the leader of the Seraphim (making him second only to God). Seraphim are so close to God that they literally burn with His glory (hence the name, and the flames). When Lucifer and one third of the angels of Heaven rebelled against God, God created Hell and cast them down into it. There, Lucifer burns forevermore. His Seraphic flame serves as a constant reminder of God and His infinite love, and it burns him the worst because he was the closest to God. This is why Lucifer is the most evil entity in all of creation... for only the very best can become the very worst. Again, he was second to God. This means that only God was higher than him. Satan is basically the second-most powerful being in all of existence.
- If fire is a manifestation of God's glory, and Hell is the furthest place from God, and the Seraphim are literally on fire because they were so close to God, then imagine how much hotter the flames in Heaven are. The fires of Hell would be freezing cold compared to these flames. Of course the fire of God's love and glory isn't gonna harm whoever's in Heaven, because all who reside there are now one with God, and will forever partake in his love and glory.
If you read the Bible, you will clearly see that the Devil's plan was and is to divide and conquer. His ultimate goal is to defile God's most precious creation, mankind, and turn them against God. Human sacrifice, worship of foreign gods (who wound up being demons or other inferior creatures), occult practice, the desecration and abuse of anything sacred and holy, etc. You name it. He'll try anything.
People cannot ever hope to fight an enemy whom they do not know or believe in.
The reason why Doom's version of Hell is inconsistent with what we actually know about Hell is because the Devil doesn't have that kind of power. God never allows anything bad to happen unless it's to allow a greater good to follow (whether or not we can foresee it). Demons are weak, evil spirits that are the creation of the Devil or any other angels who reside in Hell with him, who cower at the mention of Christ or any of the saints (those who have made it to Heaven). They are spiritual, and not physical. They can only possess those who have opened themselves up to bad spiritual influence (via very grave sin). And even from there, they can be exorcised. For the Devil to merely kill people will not work as then those who still were obedient to God will go with God, and those who sided with the Devil will go with the Devil. It's pointless. It's not enough. Humanity must willingly relinquish its rights to the kingdom of God in order for the Devil's plan to work.
Satan's plan plays out like a chess game, rather than a video game. Chess is purely a game of strategy, and as such it requires much time and patience. Although, if you really think about it, the Devil would probably have it no other way. Only exciting things get noticed easily. Lucifer relishes in his subtlety. So, if people don't notice what's happening... well... people cannot ever hope to fight an enemy whom they do not know or believe in.
Wow. That's a lot to take in, huh?
I'm just halfway done.
Let me now explain why I love Doom so much:
At its very best, Doom is a very well-crafted metaphor about life and struggle. Doom is, essentially, a game about a man who faces seemingly impossible odds with limited resources and yet manages to overcome said odds in the end. It doesn't come without its challenges... knowing what each weapon does and its purpose in the game, knowing where to find supplies, knowing the best ways to handle the demons you face (of which there are more than plenty), and then figuring out how to progress from there, when the task at hand is done. You learn your limits (and sometimes you break them), find your way, surpass your expectations, and survive and even thrive through it all. You unlock secrets. Doom is a complex mix of many complex factors which melds together in a way that is challenging, and yet satisfying. Some people play the easy way. Others will work to make sure they get everything out of the game that they possibly can. No two games are ever exactly the same. Each experience is unique.
Such is the way of life. For through great suffering comes great reward. What makes life worth living is, oddly enough... conflict. This is what makes movies and stories and games so great... because of conflict. Dealing with conflict is what makes us grow... mentally, physically, emotionally, and spiritually. You learn about yourself, about the world, about others, and the purpose of it all. You figure out the best ways to solve problems (of which there are more than plenty) and then figure out how to progress from there, when the task at hand is done. You learn about your limits (sometimes even break them), navigate through life, exceed your expectations, and survive and even thrive through it all. You discover things about yourself you didn't think were even possible. Life is a complex mix of even more complex factors, which makes it both challenging and yet satisfying. Some people decide to play it safe. Others will work to make sure they get everything out of life that they possibly can. No two lives are ever exactly the same. Each experience is unique.
Anybody else got deja vu?
This is actually one of the best lessons God can teach us about life... suffering never has to be in vain. It is one of the greatest sacrifices that can be offered up to God. You will be able to work it out. Anything from the smallest inconvenience to the largest of blows, you will always have the potential to overcome it and come out on top, because you were made to persevere. What doesn't kill you makes you stronger. You'll smile through adversity and you will become one of the strongest people ever to walk the Earth. Death will not conquer you. You will be incorruptible and unyielding.
Just like Doomguy.
Experience will build and expand on experience. You can learn from others and mix it with what you already know. And, of course, God will always be there to help. The way you weave it all together and use what you have learned will help you later on in life... whether it comes to navigation, facing demons, dealing with being knocked down, or anything else that'll come your way. It is up to you to decide how you'll conquer your demons and move the ball forward.
So what will you do when you face your demons?