He is absolutely certain. Elias can't help but raise an eyebrow as he dryly points out,

"Why not? After all, there are certainly things that someone might think more ridiculous than a sentient cult-starting lobster. Ten foot tall owlish beasts. Visions of your own death. Suddenly being thrust a hundred or so years into the future. All patently ridiculous and yet they've all happened to or are people here."