- The whole notion that the Archangel Gabriel, basically God's Big Good Nice Guy "Left Hand," having maddened into misanthropy and wanting humanity to die is terrifying to any religious viewer. The fact that nothing short of God or another Archangel can stop him when he's on Earth even more so, especially for the human protagonists who are notably Catholic and basically have one of their figures of praise trying to actively murder them.
- Viggo Mortensen as Lucifer is an intelligently evil and hauntingly creepy portrayal.Lucifer: [to Thomas] I love you more than Jeesssussss!
- Lucifer sneaks up on Thomas and recounts how, as a child, Thomas would jump into bed, thinking Lucifer was hiding under the bed, then tells Thomas, "And I was!"
- Lucifer's description of souls being trapped in their bodies left on Earth for thousands of years and unable to meet God in Heaven due to the Second Angel War closing off Heaven. He mentions the fate being so terrible that souls willingly chose to come to him in Hell because, despite Heaven being closed, Hell is always open. Even on Christmas. (It's hinted he's lying, since Rachael says she was about to Go into the Light.)
- Gabriel describing his acts of killing firstborns "while their mamas watch" and turning turn cities into salt alludes to the Tenth Plague of Egypt and the destruction of Sodom and Gomorrah, heavily implying that he was the one responsible. He says this before he plans to tear apart Mary, who's housing Colonel Hawthorne's evil soul. He even tries to rip the Nephilim fetus out of Valerie, the female lead, in the second film while only calling it "business."
- The whole notion of tearing out an angel's heart being the only way to kill them is unsettling, especially when the film shows angels ripping out each other's hearts.
- Thomas' visions of Heaven in the first film. They're downright horrific as they show countless angels screaming and moaning in agony while being impaled on pikes in a way that would make Vlad the Impaler blush.
Nightmare Fuel / The Prophecy
WARNING: Spoilers are unmarked.