Jokes aside, I'm not convinced that Chris genuinely thinks he's Jesus reincarnated. I think he's aware of the pop culture trope of "crazy people do stuff like claim they're Jesus" and he's decided to go down the insanity defence route (or more likely, he's heard his defence attorney bring up the possibility of a "diminished capacity" defence in conversation and thought this a suggestion to fake insanity instead of referring to his actual autism).
The reason I lean more towards the "he's faking it" camp is because Chris has never been a particularly religious person, he's never expressed a real interest in Christianity or the Bible until now. Idk, I just don't see someone who isn't already devoutly religious having a delusion like that. If he was claiming he was actually Sonichu then I'd be more convinced.