1) All animals, including theropod dinosaurs, were created as herbivores.
Here is an illustration from Paul S. Taylor's The Great Dinosaur Mystery and the Bible (yes, that is an actual title):
For those using screen-readers, it depicts two Dilophosaurus (the dinosaur that killed Nedry in Jurassic Park) munching on veggies.
At the time (1989), Dilophosaurus was thought to have thin, delicate crests and very weak jaws. The conventional explanation for this was that it specialized in small prey like fish and lizards. Michael Crichton got more creative in Jurassic Park, famously speculating that Dilophosaurus was venomous.
Creationists, on the other hand, took this as evidence that Dilophosaurus, along with all other theropods, was created as a herbivore.
See, creationists take every word of the Bible super literally (except for the ones that don't support their theology), so when Genesis 1:30 says "and to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat," they take it as fact that all animals are naturally vegan and carnivorism is a result of Adam's curse.
To prop up this extraordinary claim, they point to living herbivores with sharp teeth like fruit bats, gorillas, and pandas. What they miss is that only the canines of these animals are sharp. Their food-processing teeth are still adapted to chew vegetable matter. They don't in any way compare to the blood-letting teeth of a carnosaur or the bone-crushing jaws of a tyrannosaurid.
2) Fire-breathing hadrosaurs.
Let me circle back to the dinosaur-dragon connection as well as influential creationist Duane Gish.
Gish had a remarkable theory about the origin of the fire-breathing dragon myth. Leading experts hold the opinion that fiery breath originated as a symbol of the fires of hell or simply volcanic activity, but such abstract symbolism is beyond the literal mindset of the creationist. Gish set out to kill two birds with one stone and solve the mysteries of the fire-breathing dragon and what hadrosaurs did with their crests.
That's right, he posited that the hollow chambers in these crests acted as combustion chambers like those on a bombardier beetle.
Here we have an illustration by Earl and Bonita Snellenberger from Gish's Dinosaurs by Design of a Parasaurolophus immolating an attacking Ceratosaurus. The anachronistic nature of the encounter is the very least of our problems.
This would have no doubt been spectacular to witness in those dinosaur arena battles depicted in the Ark Encounter.